Dear Nayak.Sooraj,
It appears that you are using some customized FAST model rather than one provided by NREL. You mention Test18, but based on the messages, the first simulation appears to be some modified form of Test24 (using a WAMIT output file named ssv) and the second simulation is using a primary FAST input file names DeepCwind.fst. What did you change in the input files from one of the FAST models provided?
The first simulation seems to have an error related to the format of the MAP input file. Hopefully you know what you changed in the MAP input file to know why this error is triggered.
The second simulation seems to have an error in the Jacobian set up in the glue code where the coupling between ElastoDyn and HydroDyn happens. I’m not sure what would trigger this error unless the platform mass/inertia in ElastoDyn are set to zero or the added mass is the opposite of the platform mass/inertia such that there sum is zero. Perhaps upgrading from FAST v8.15 to FAST v8.16 or OpenFAST v1.0.0 would also help?
Best regards,