Hi, the blade data input file and Airfoil data input file should follow the directory and file name written in the AeroDyn primary input file, and the same for the inflow wind file. So please check if those files are in the correct directory and with the correct name. For example in the ad_primary_example.dat file downloaded from the AeroDyn manual I sent, the blade data input file should be in the same directory as the primary file and named Test01_UAE_AeroDyn_blade.dat.
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