I am trying to run a composite sizing optimization and when I run optistruct it is able to run through iteration 0 but as soon as it starts iteration 1 it encounters:
The updated TOTAL_Ti in parts of STACK # 1 is invalid.
The updated TOTAL_Ti is zero.
(x16)
*** ERROR # 789 ***
Invalid design properties w.r.t. the design variables were found.
number of invalid property items = 16
This error occurs in module 'chkpdrv'.
Any suggestions are greatly appreciated.
