[ODBC Microsoft Access Driver] Database already exists

Hello,

I've created the ODBC alias for Access named DB1

Put the TDataBase component on the form using AliasName = DB1

Once it worked great. But next time when I tried to connect the ODBC Error
was occured:

Key violation
[Microsoft][ODBC Microsoft Access Driver] Database already exists.
Alias DB1.

Are there some ideas ?

Thanks.
Vasily.