While filling the my employer name , I got a problematic field error. The name consists of the symbol "+" and most probably that is causing the validation error.
Then don't use the "+". Omit it or use a substitute word.
Honestly this is a pettier matter than you think it is. You're probably thinking the employer name needs to be exact, but they're not going to overhaul the Express Entry field validation system for companies that use symbols in their names.