Anaconda Prompt Navigator start error: UnicodeDecodErrorError

Navigator does not launch from start menu. Tried launching from Anaconda Prompt (does work) which aborts loading and get UnicodeDecoderError: 'utf-8 codec can’t decode byte 0xfe in position 1: invalid start byte. Any help? see attached trace.

This worked for me: from the Anaconda Prompt give the command:
anaconda-navigator --reset
Then try launching again anaconda-navigator from the prompt.