Gmail and AdSense Login Error!
Google reported that the problem which some of the AdSense users had been encountering, that of not being able to login to their accounts, was found a reason and a workaround until further action is to be taken, but more about this a bit further down the page.
The error, "Welcome! You're signed in to Google
Accounts under the email [your email address] and your Google Account password, but this is not a valid AdSense login," is caused by the same password being used for both the Gmail account and the AdSense one. That is said to be the reason in 99.9 percent of the cases, so if you encountered it, you’d better go and change your password for one of the two.
Arlene Lee, with the AdSense Publisher support, has provided the first method of doing so, "first ensure that you're logged out of Google Accounts for any other products you use, such as Gmail or AdWords. Then, change your AdSense password at https://www.google.com/adsense/assistlogin. You’ll be asked to submit your login email address to us, and we’ll then send a reset link to that address. When changing your AdSense password, please be sure to select a unique password that you’re not using with any other Google product. After you've changed your AdSense password, please try logging in again at www.google.com/adsense."
What I said I’d get back to is the fact that the workaround is not actually a solution in the traditional way. That comes to be because the Google plan to create global profiles has not been set in motion yet. Once that happens, there will be just one account and one password for all of the services used, courtesy of the Mountain View-based company. Until then, just be sure you don't make the mistake above, even if it's easier to remember just one password.
source : news.softpedia.com