I can't access Gmail on my Android Razr. I get the message "Invalid Credentials" when I try to input password. I can't delete the account because I get the same "invalid credentials" message when I try. I read through a number of threads on this topic

[dwsjds]

I can't access Gmail on my Android Razr.  I get the message "Invalid Credentials" when I try to input password.  I can't delete the account because I get the same "invalid credentials" message when I try.  I read through a number of threads on this topic that were posted mostly in 2012.  But nothing recent. Any new ideas on this problem?  I have tried almost everything I can from home except the factory reset.  I am accessing this Gmail account OK on other devices.  Thanks.