Error when installing the Symbolic Toolbox on Matlab R2015b

The toolbox used to work just fine. After some problems, I decided to uninstall it and install it again through the add-ons window. Now, it gets to 99% of the installation and then gives an error, which refers to the following log file. What is the issue? Thanks

(apr 04, 2018 09:54:26) ################################################################## (apr 04, 2018 09:54:26) # (apr 04, 2018 09:54:26) # Today's Date: (apr 04, 2018 09:54:26) Wed Apr 04 09:54:26 CEST 2018 (apr 04, 2018 09:54:26) (apr 04, 2018 09:54:26) System Info (apr 04, 2018 09:54:26) OS: Mac OS X 10.10.5 (apr 04, 2018 09:54:26) Arch: x86_64 (apr 04, 2018 09:54:26) Data Model: 64 (apr 04, 2018 09:54:26) Language: it (apr 04, 2018 09:54:26) Java Vendor: Oracle Corporation (apr 04, 2018 09:54:26) Java Home: /Applications/MATLAB_R2015b.app/sys/java/jre/maci64/jre (apr 04, 2018 09:54:26) Java Version: 1.7.0_75 (apr 04, 2018 09:54:26) Java VM Name: Java HotSpot™ 64-Bit Server VM (apr 04, 2018 09:54:26) Java Class Path: /Applications/MATLAB_R2015b.app/java/config/trialsinstaller/pathlist.jar (apr 04, 2018 09:54:26) User Name: luca (apr 04, 2018 09:54:26) Current Directory: /Users/luca/Polybox/PhD/Simulations/CDC2018/Input_sharing (apr 04, 2018 09:54:26) Input arguments: (apr 04, 2018 09:54:26) root /Applications/MATLAB_R2015b.app (apr 04, 2018 09:54:26) libdir /Applications/MATLAB_R2015b.app (apr 04, 2018 09:54:26) basecode.SM true (apr 04, 2018 09:54:26) standalone true (apr 04, 2018 09:55:05) Uninstalling Product: Symbolic Math Toolbox 6.3 (apr 04, 2018 09:55:27) Exiting with status 0 (apr 04, 2018 09:55:29) End - Successful. (apr 04, 2018 09:57:05) ################################################################## (apr 04, 2018 09:57:05) # (apr 04, 2018 09:57:05) # Today's Date: (apr 04, 2018 09:57:05) Wed Apr 04 09:57:05 CEST 2018 (apr 04, 2018 09:57:05) (apr 04, 2018 09:57:05) System Info (apr 04, 2018 09:57:05) OS: Mac OS X 10.10.5 (apr 04, 2018 09:57:05) Arch: x86_64 (apr 04, 2018 09:57:05) Data Model: 64 (apr 04, 2018 09:57:05) Language: it (apr 04, 2018 09:57:05) Java Vendor: Oracle Corporation (apr 04, 2018 09:57:05) Java Home: /Applications/MATLAB_R2015b.app/sys/java/jre/maci64/jre (apr 04, 2018 09:57:05) Java Version: 1.7.0_75 (apr 04, 2018 09:57:05) Java VM Name: Java HotSpot™ 64-Bit Server VM (apr 04, 2018 09:57:05) Java Class Path: /Applications/MATLAB_R2015b.app/java/config/trialsinstaller/pathlist.jar (apr 04, 2018 09:57:05) User Name: luca (apr 04, 2018 09:57:05) Current Directory: /Users/luca/Polybox/PhD/Simulations/CDC2018/Input_sharing (apr 04, 2018 09:57:05) Input arguments: (apr 04, 2018 09:57:05) root /Applications/MATLAB_R2015b.app (apr 04, 2018 09:57:05) libdir /Applications/MATLAB_R2015b.app (apr 04, 2018 09:57:05) matlabargs "-r "matlab.internal.addons.cdAndShowAddon('SM')"" (apr 04, 2018 09:57:05) addonMode potlicMode (apr 04, 2018 09:57:05) entitlementId 1833007 (apr 04, 2018 09:57:05) Argument not logged (apr 04, 2018 09:57:05) basecode.SM true (apr 04, 2018 09:57:05) standalone true (apr 04, 2018 09:57:09) Starting local product/component search in download directory (apr 04, 2018 09:57:09) Searching for archives... (apr 04, 2018 09:57:09) /Users/luca/Downloads/MathWorks/R2015b/archives doesn't exist ... skipping. (apr 04, 2018 09:57:09) Archive search complete. 0 total files found. (apr 04, 2018 09:57:09) Completed local product/component search (apr 04, 2018 09:57:11) Contacting MathWorks (apr 04, 2018 09:57:18) Retrieving license data (apr 04, 2018 09:57:18) Assembling product list... (apr 04, 2018 09:57:18) Retrieving product data (apr 04, 2018 09:57:19) Verifying account information (apr 04, 2018 09:57:20) Completed local product/component search (apr 04, 2018 09:57:23) Completed local product/component search (apr 04, 2018 09:57:28) Confirmation Text: Requested Products: Symbolic Math Toolbox 6.3

Installation folder: /Applications/MATLAB_R2015b.app

Download Size: 264 MB Installation Size: 736 MB

(apr 04, 2018 09:57:34) Starting Download: Symbolic Math Toolbox 6.3 : 277.057.678 bytes (apr 04, 2018 09:58:19) Installing Product: Symbolic Math Toolbox 6.3 (apr 04, 2018 09:58:44) java.io.FileNotFoundException: /Applications/MATLAB_R2015b.app/toolbox/local/pathdef.m (Permission denied) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.(FileOutputStream.java:221) at com.mathworks.instutil.FileIO.copyToFileFromStream(FileIO.java:480) at com.mathworks.instutil.FileIO.createFileFromStream(FileIO.java:158) at com.mathworks.instutil.FileIO.createFileFromStream(FileIO.java:149) at com.mathworks.install.command.PathdefGeneratorCommand.writePathdefFile(PathdefGeneratorCommand.java:281) at com.mathworks.install.command.PathdefGeneratorCommand.generatePathdef(PathdefGeneratorCommand.java:93) at com.mathworks.install.command.PathdefGeneratorCommand.execute(PathdefGeneratorCommand.java:59) at com.mathworks.matlabinstaller.AbstractMatlabInstallConfiguration$3.execute(AbstractMatlabInstallConfiguration.java:535) at com.mathworks.install.InstallModule$1.installProducts(InstallModule.java:230) at com.mathworks.install.InstallerImpl.install(InstallerImpl.java:108) at com.mathworks.installwizard.model.InstallTask.execute(InstallTask.java:46) at com.mathworks.installwizard.model.AbstractBackgroundTask.execute(AbstractBackgroundTask.java:38) at com.mathworks.installwizard.model.AbstractTask.call(AbstractTask.java:73) at com.mathworks.installwizard.model.AbstractTask.call(AbstractTask.java:23) at com.mathworks.wizard.worker.WorkerImpl.doInBackground(WorkerImpl.java:24) at javax.swing.SwingWorker$1.call(SwingWorker.java:296) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at javax.swing.SwingWorker.run(SwingWorker.java:335) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

(apr 04, 2018 09:58:44) Error: The application encountered an unexpected error and needs to close. You may want to try re-installing your product(s). More information can be found at /var/folders/tb/rk_t1z816xv8kmw0xp_sl4640000gp/T/mathworks_luca.log (apr 04, 2018 09:58:50) Exiting with status -1 (apr 04, 2018 09:58:51) End - Unsuccessful. (apr 04, 2018 10:04:27) ################################################################## (apr 04, 2018 10:04:27) # (apr 04, 2018 10:04:27) # Today's Date: (apr 04, 2018 10:04:27) Wed Apr 04 10:04:27 CEST 2018 (apr 04, 2018 10:04:27) (apr 04, 2018 10:04:27) System Info (apr 04, 2018 10:04:27) OS: Mac OS X 10.10.5 (apr 04, 2018 10:04:27) Arch: x86_64 (apr 04, 2018 10:04:27) Data Model: 64 (apr 04, 2018 10:04:27) Language: it (apr 04, 2018 10:04:27) Java Vendor: Oracle Corporation (apr 04, 2018 10:04:27) Java Home: /Applications/MATLAB_R2015b.app/sys/java/jre/maci64/jre (apr 04, 2018 10:04:27) Java Version: 1.7.0_75 (apr 04, 2018 10:04:27) Java VM Name: Java HotSpot™ 64-Bit Server VM (apr 04, 2018 10:04:27) Java Class Path: /Applications/MATLAB_R2015b.app/java/config/trialsinstaller/pathlist.jar (apr 04, 2018 10:04:27) User Name: luca (apr 04, 2018 10:04:27) Current Directory: /Users/luca/Polybox/PhD/Simulations/CDC2018/Input_sharing (apr 04, 2018 10:04:27) Input arguments: (apr 04, 2018 10:04:27) root /Applications/MATLAB_R2015b.app (apr 04, 2018 10:04:27) libdir /Applications/MATLAB_R2015b.app (apr 04, 2018 10:04:27) matlabargs "-r "matlab.internal.addons.cdAndShowAddon('SM')"" (apr 04, 2018 10:04:27) addonMode potlicMode (apr 04, 2018 10:04:27) entitlementId 1833007 (apr 04, 2018 10:04:27) Argument not logged (apr 04, 2018 10:04:27) basecode.SM true (apr 04, 2018 10:04:27) standalone true (apr 04, 2018 10:04:31) Starting local product/component search in download directory (apr 04, 2018 10:04:31) Searching for archives... (apr 04, 2018 10:04:31) Reading /Users/luca/Downloads/MathWorks/R2015b/archives (apr 04, 2018 10:04:31) 52 files found in /Users/luca/Downloads/MathWorks/R2015b/archives (apr 04, 2018 10:04:31) Archive search complete. 52 total files found. (apr 04, 2018 10:04:31) Completed local product/component search (apr 04, 2018 10:04:33) Contacting MathWorks (apr 04, 2018 10:04:38) Retrieving license data (apr 04, 2018 10:04:38) Assembling product list... (apr 04, 2018 10:04:38) Retrieving product data (apr 04, 2018 10:04:39) Verifying account information (apr 04, 2018 10:04:40) Completed local product/component search (apr 04, 2018 10:04:42) Completed local product/component search (apr 04, 2018 10:04:49) Confirmation Text: Requested Products: Symbolic Math Toolbox 6.3

Installation folder: /Applications/MATLAB_R2015b.app

Installation Size: 472 MB

(apr 04, 2018 10:04:52) Installing Product: Symbolic Math Toolbox 6.3 (apr 04, 2018 10:07:57) java.io.FileNotFoundException: /Applications/MATLAB_R2015b.app/toolbox/local/pathdef.m (Permission denied) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.(FileOutputStream.java:221) at com.mathworks.instutil.FileIO.copyToFileFromStream(FileIO.java:480) at com.mathworks.instutil.FileIO.createFileFromStream(FileIO.java:158) at com.mathworks.instutil.FileIO.createFileFromStream(FileIO.java:149) at com.mathworks.install.command.PathdefGeneratorCommand.writePathdefFile(PathdefGeneratorCommand.java:281) at com.mathworks.install.command.PathdefGeneratorCommand.generatePathdef(PathdefGeneratorCommand.java:93) at com.mathworks.install.command.PathdefGeneratorCommand.execute(PathdefGeneratorCommand.java:59) at com.mathworks.matlabinstaller.AbstractMatlabInstallConfiguration$3.execute(AbstractMatlabInstallConfiguration.java:535) at com.mathworks.install.InstallModule$1.installProducts(InstallModule.java:230) at com.mathworks.install.InstallerImpl.install(InstallerImpl.java:108) at com.mathworks.installwizard.model.InstallTask.execute(InstallTask.java:46) at com.mathworks.installwizard.model.AbstractBackgroundTask.execute(AbstractBackgroundTask.java:38) at com.mathworks.installwizard.model.AbstractTask.call(AbstractTask.java:73) at com.mathworks.installwizard.model.AbstractTask.call(AbstractTask.java:23) at com.mathworks.wizard.worker.WorkerImpl.doInBackground(WorkerImpl.java:24) at javax.swing.SwingWorker$1.call(SwingWorker.java:296) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at javax.swing.SwingWorker.run(SwingWorker.java:335) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)

(apr 04, 2018 10:07:57) Error: The application encountered an unexpected error and needs to close. You may want to try re-installing your product(s). More information can be found at /var/folders/tb/rk_t1z816xv8kmw0xp_sl4640000gp/T/mathworks_luca.log (apr 04, 2018 10:09:12) Exiting with status -1 (apr 04, 2018 10:09:13) End - Unsuccessful.