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Hello, i tried to solve the Optistruct OS-T 1600 Tutorial, but after starting the two solvers (optistruct, acusolve) there is a convergence error of acusolve that stops the job: Messages for the job: *** ERROR # 5202 *** Acusolve stops before FSI iteration achieves convergence. *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED. Does anyone knows the problem? I checked all steps of the tutorial and start it again, but the error still appears. The next step was to change the convergence criterio of acusolve (convergence_tolerance) and optistruct (fsi card: FCNVTOL, DCNVTOL) and the exchange parameter of acusolve (min/max_stagger_iterations) and optistruct (min/maxEX), but the error still appears. Does anyone has got experience with the tutorial OS-T 1600 and solved it successfull? Thank you very much in advance.