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Editorial Team
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Asked: 2026-05-24T07:35:27+00:00

—— Clean started: Project: DataService, Configuration: Debug Any CPU —— O/R Designer validation failed

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------ Clean started: Project: DataService, Configuration: Debug Any CPU ------
O/R Designer validation failed for file: a.dbml
O/R Designer validation failed for file: b.dbml
O/R Designer validation failed for file: c.dbml
O/R Designer validation failed for file: d.dbml
O/R Designer validation failed for file: e.dbml
O/R Designer validation failed for file: f.dbml
Error: The operation could not be completed. Unspecified error

This error is intermittent. Sometimes the clean is fine, sometimes this happens.

I’m running VS2008 version 9.0.30729.1 SP – 64bit.

Is there some way I can disable the O/R designer’s validation or otherwise stop this from occuring?

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1 Answer

  1. Editorial Team

    I had to close Visual Studio and reopen it. Solved this for me. In another case I had to roll back my DBML file, then close Visual Studio, and reopen it.

    Looks like a bug for Microsoft to fix.

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