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I am trying to run an example, provided by altair on their help page, about vibroacoustic interaction and wave propagation using infinite elements CACINF3. The link to the page is: https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/acoustic_analysis_of_speaker_os_example_r.htm#results However, I am unable to run the problem using optistruct 2017. The error message given is: The model file follows attached. Speaker_IE-C.fem