@AbrahamYezioro, it is not about invalid EP syntax or out of range values, as these are directly extracted from EP data sets.
I did some trial and error tests and realized that the error occurs for example in case of a specific material called “F16 Acoustic tile”. I checked OS library and saw that a material with the same name exists there. So, my guess is that, ExportToOpenStudio cannot handle duplicate names resulting from objects coming from default and user libraries. You can use my user library to test.
userCustomEPLibrary.idf (594 Bytes)
Note that, I do not have this problem with runEnergySimulation component. So, if my guess is correct, either it can handle duplicate names or its library has no overlap with EP materials and schedules datasets.