AttributeError: type object 'JSONGenerator' has no attribute '<INVALID>'

[bendrissou]

I was trying to generate json files using the --population option and the antlr json grammar. The grt files have been prepared with no problem. But I get an error when I run the following command:

grammarinator-generate JSONGenerator.JSONGenerator -r json -o tests/test_%d.json -d 20 -n 1 --population ../seeds/grts --no-generate --sys-path .

The error output:

Test generation failed.
Traceback (most recent call last):
  File "/home/bachir/.local/lib/python3.8/site-packages/grammarinator/generate.py", line 119, in create_new_test
    tree = generator(self.rule, self.max_depth)
  File "/home/bachir/.local/lib/python3.8/site-packages/grammarinator/generate.py", line 197, in recombine
    options = self.default_selector(node for rule_name in common_types for node in tree_1.node_dict[rule_name])
  File "/home/bachir/.local/lib/python3.8/site-packages/grammarinator/generate.py", line 213, in default_selector
    return [node for node in iterable if node.name is not None and node.parent is not None and node.name != 'EOF' and node.level + min_depth(node) < self.max_depth]
  File "/home/bachir/.local/lib/python3.8/site-packages/grammarinator/generate.py", line 213, in <listcomp>
    return [node for node in iterable if node.name is not None and node.parent is not None and node.name != 'EOF' and node.level + min_depth(node) < self.max_depth]
  File "/home/bachir/.local/lib/python3.8/site-packages/grammarinator/generate.py", line 211, in min_depth
    return getattr(getattr(self.generator_cls, node.name), 'min_depth', 0)
AttributeError: type object 'JSONGenerator' has no attribute '<INVALID>'

The error does not occur if option --population is omitted. In addition, the seed inputs have been successfully parsed into grt files. The error occurs with any provided grt file.

Any idea what could be the cause of this?

[renatahodovan]

@bendrissou Thanks for the report! Hopefully it is fixed now.