spmd: Attempt to reference field of non-structure array.

Error using spmd_feval (line 8)
Error detected on lab(s) 2
Error in test (line 89)
              pause(1)
Caused by:

    Attempt to reference field of non-structure array.

    Error stack:
    atan_pos>atan_pos_small at 59
    atan_pos.m at 33
    atan.m at 52

Good evening,

i have created a composite variable. This variable is used within a spmd statement. What could cause such a failure?

Thank you very much, Konrad