The error occurred while parsing the regular expression fragment: ' The error occurred while parsing the regular expression: ' A regular expression cannot start with the alternation operator |. An error has occurred while reading the UI file at line %1, column %2: %3 Error from reader: %s Error in thread safety code: could not acquire a lock In Json::Value::setComment(): Comments must start with / QFormBuilder was unable to create a custom widget of the class '%1' defaulting to base class '%2'. QFormBuilder was unable to create a widget of the class '%1'. The repeat operator * cannot start a regular expression. The repeat operator + cannot start a regular expression. The repeat operator ? cannot start a regular expression. Unable to open message catalog: Unable to parse token length