The error message usually will occur when the account you log in with does not have a LOTRO subscription associated with it. For example, you play DDO so your Turbine account has a DDO subscription on it. If you try to log into LOTRO with that account, you get the error there is no LOTRO subscription. You would need to contact Account Management to get a special key that adds a LOTRO subscription to your account with the DDO subscription.
Are you sure you are logging in with the same account/subscription you played on before? Do you have more than one Turbine account? If nothing else works then contact Account Management for help with this.
"Everyone's got one. Better to be a smart one than a dumb one." - me
"It's people like you that [I]think[/I] you know everything that give those of us that [I]do[/I] a bad name." - me
"Eat, drink, and be Merry, 'cause Pippin was a fool of a Took."