To be able to perform full-text searches in user dictionaries, Lingvo builds an index for each user dictionary you attach. If the index becomes physically corrupted (this may happen if you temporarily ran short of free disk space), you need to rebuild the index. Simply remove the corrupted index files from your system and Lingvo will rebuild the index when you enter your new query.
To delete the corrupted index:
If you click No button, the index won't be deleted. In that case you won't be able to use full-text search.
You can delete the corrupted index by using the following Lingvo system options: