Microsoft KB Archive/172192

= PRB: Error: "Failed to Get Expression Service" =

Article ID: 172192

Article Last Modified on 11/7/2002

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APPLIES TO


 * Microsoft Open Database Connectivity 2.1

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This article was previously published under Q172192



SYMPTOMS
Installation of ODBC 16-bit components with incompatible versions of OLE DLLs causes the error "Failed to get expression service."

The installation of ODBC 2.1x SDK on a fresh installation of Windows 95 also causes the error message described above.

The following table shows the difference in version numbers of the OLE DLLs that cause this problem.                               Version installed with File name        Windows 95         Windows NT         ODBC 2.1x SDK -

Compobj.dll         2.2               2.1                  2.02 Ole2.dll            2.2               2.1                  2.02 Ole2conv.dll        2.01              2.1                  2.01 Ole2disp.dll        2.1               N/A                  2.02 Ole2nls.dll         2.1               2.1                  2.02 Stdole.tlb          2.1               2.1                  4.2kb (has no                                                         internal version) Storage.dll         2.2               2.1                  2.02

Typelib.dll         2.1               2.1                  2.02 Because the files that come with the ODBC 2.1x SDK are older(16-bit) than the ones that come with Windows 95, these files are not overwritten.



WORKAROUND
To work around this problem on a computer running Windows 95, delete the existing files mentioned above in the /System directory and reinstall the ODBC 2.1x SDK. Make sure that the files have the correct version numbers after the ODBC 2.1x SDK reinstallation.



MORE INFORMATION
On computers running Windows NT 4.0, this does not cause a problem because the versions of the above files later than 2.02 are the 16/32 interoperability OLE DLLs (32-bit), and are installed in the /System32 directory. A fresh installation of the 16-bit ODBC components from the ODBC 2.1x SDK are installed into the /System directory.

Additional query words: odbc2.1x

Keywords: kbinterop kbenv kbprb KB172192

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