_check_xtts_builtin_speakers() calls non-existent _load_engine(), breaking all non-English XTTS voice conversion #1628
Description
In lib/classes/tts_engines/common/utils.py line 382, after the built-in voice conversion (eng → target language) completes and cleans up the internal model, the code attempts to reload the TTS
engine:
self.engine = loaded_tts.get(self.tts_key, False)
if not self.engine:
self._load_engine()
Two bugs:
- self._load_engine() does not exist. The correct method name is self.load_engine() (no underscore prefix). This raises AttributeError: 'XTTSv2' object has no attribute '_load_engine', which is
silently caught by the except Exception at line 403. - The return value is not assigned to self.engine, so even with the correct method name, the engine would remain None/False.
Fix:
self.engine = self.load_engine()
Impact: Every non-English language using XTTS with a built-in voice fails completely. The voice conversion succeeds and deletes the engine from loaded_tts to free memory, then fails to reload
it. self.engine stays False, and every subsequent convert() call fails with "TTS engine {engine} failed to load!".
English is unaffected because _check_xtts_builtin_speakers() short-circuits at line 270 when the language is eng, so the broken reload path is never reached.
Reproduction:
- Use XTTS with a built-in English voice
- Set target language to any non-English language (e.g., deu, spa)
- Every sentence will fail with "TTS engine xtts failed to load!"
Worker log shows:
_check_xtts_builtin_speakers() error: 'XTTSv2' object has no attribute '_load_engine'
_set_voice() error: Could not create the builtin speaker selected voice in deu
TTS engine xtts failed to load!