Error- "Cannot access database (error=49153)" during login to an existing system. Open Sage Database Setup and the Company and System Database Profiles. Verify what Data Source or Server name, Login ID and Database names are set. Open the 32-bit version of ODBC Data Source Administrator, either from Control Panel > Administrative Tools > Data Sources (ODBC), or from C:\Windows\SysWOW64\odbcad32.exe on 64-bit PCs.
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