Why Can't I Load 'SQLite.Interop.dll'?

Resolving 'SQLite.Interop.dll' Loading Errors

Developers frequently encounter this error when using 'SQLite.Interop.dll':

<code>Unable to load DLL 'SQLite.Interop.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)</code>

This problem, often seen on 64-bit Windows 7 systems with VS2010 and 'SQLite.Interop.dll' version 1.0.82.0, appears inconsistently in both debug and release modes, inside and outside Visual Studio.

Effective Solution:

A proven solution involves installing the NuGet package in both the DLL project and the main application project. This ensures 'SQLite.Interop.dll' loads the correct version based on the main project's assembly.

Understanding the Problem:

The likely cause is 'SQLite.Interop.dll' referencing a DLL from the local machine cache during loading. If the main and DLL projects use different 'SQLite.Interop.dll' versions, a mismatch between the main project's cached DLL and the version required by the system cache can occur. Installing the NuGet package in the main project synchronizes the versions, eliminating the conflict.

While this solution has worked for many, it's not a universal fix. However, it provides a practical solution for the described environment.

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