For me, ever since the new NCsoft launcher was introduced I've always gotten this error. Always. Every patch, every small update, I get this error. NEVER had it happen to me before with the old school launcher. You CAN still play the game though. Simply hit cancel during the verifying (You know, the part it runs before giving you the error) and the game will launch as normal and play as if there's no problem at all.
Edit: Just wanted to include that it gives you another prompt warning of crashing due to corrupt files, etc. CoH has been randomly crashing for years. There's times when I've skipped this verifying bit and have not crashed for weeks. It's all gravy.
