class_docstr: Exception indicating processor or processor registration failure 
class_docstr_tok: ["Exception","indicating","processor","or","processor","registration","failure"]
code: def build_message(self):
      self.message = f"Failed to register '{self._processor_class}'. It must be a subclass of '{self._expected_parent}'."
  
imports: from abc import ABC, abstractmethod
  from stanza.models.common.doc import Document
  from stanza.pipeline.registry import NAME_TO_PROCESSOR_CLASS, PIPELINE_NAMES, PROCESSOR_VARIANTS
label_desc: Use image node_id 2 for calling the ProcessorRegisterException obj's underlying member method code with example usage: obj.build_message() without return types