Error that is raised when constructing a
SamplerLoop instance that is invalid. “Invalid” means that one or more fields have a value that can't be encoded in the field inside a *.wav file. For example, there's no way to encode “-23” as a value for the start_sample_frame field. However, this error _won't_ be raised for values that can be encoded, but aren't semantically correct. For example, it's possible to set the start_sample_frame or end_sample_frame fields to values that don't correspond to the actual sample frame range of the file. This error _won't_ be raised for “encodeable but not semantically valid” field values.