Under the "App won't launch" section.
Case 1: YAMLParseError
As of v5.6.0, the app converts the config file format from CSON to JSON.
When converting it but the data had a syntax error, YAML fails to parse it like so:
Failed to load `config.cson`
YAMLParseError: All mapping items must start at the same column at line 4, column 1:
invalid: 1
betaChannel: true
^
That's mostly due to invalid indentations mixed with spaces and tabs.
Case 2: JSON Syntax Error

Failed to load `config.json`
SyntaxError: Expected property name or '}' in JSON at position 15
Under the "App won't launch" section.
Case 1: YAMLParseError
As of v5.6.0, the app converts the config file format from CSON to JSON.
When converting it but the data had a syntax error, YAML fails to parse it like so:
That's mostly due to invalid indentations mixed with spaces and tabs.
Case 2: JSON Syntax Error