The error message "System.DllNotFoundException" indicates that the DLL file "canusbdrv64.dll" could not be loaded due to the specified module being missing with the error code HRESULT 0x8007007E.

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This error message typically occurs when the system cannot locate the required DLL file or when the DLL file is corrupted. There can be several possible reasons for this error, such as:

1. Missing or corrupted system files: If some of the system files are missing or corrupted, it can cause this error message.

2. Software conflict: The DLL file might be used by another software or application, causing a conflict and preventing it from loading.

3. Outdated drivers: The drivers required to load the DLL file might be outdated, causing a compatibility issue.

4. Malware infection: If the system is infected with malware, it can modify or delete important system files, including the DLL file.

To resolve this error, you can try the following solutions:

1. Reinstall the software: If the error occurs while running a specific program, try to reinstall the program and see if it resolves the issue.

2. Repair system files: Run a System File Checker (SFC) scan to check for and repair any corrupted system files.

3. Update drivers: Ensure all drivers are up to date to avoid compatibility issues.

4. Scan for malware: Perform a malware scan to check for any virus or malware infection that might be causing the error.

5. Try running the program as an administrator: Right-click on the program, select "Run as administrator," and check if the error still occurs.