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Error MSB4018: The "SqlBuildTask" task failed unexpectedly. Microsoft.Isam.Esent.Interop.EsentVersionStoreOutOfMemoryException:

A customer contacted me about a problem on their build servers. The build for one of their applications failed sometimes with the following error message:

C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v14.0\SSDT\Microsoft.Data.Tools.Schema.SqlTasks.targets(550,5): Error MSB4018: The "SqlBuildTask" task failed unexpectedly. Microsoft.Isam.Esent.Interop.EsentVersionStoreOutOfMemoryException: Version store out of memory (cleanup already attempted) at Microsoft.Isam.Esent.Interop.Api.Check(Int32 err)

The solution contained a SQL Server Database project, that resulted in the error above. When we removed the database project from the build configuration, the error disappeared.

Further investigation brought us to a final solution; an update of the SQL Server Data Tools on the Build server solved the problem.

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