Process exited with code 4 (0x4, -252)

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This error is an application initialization error.

An error in the command-line that is passed from the BOINC client to the science application. Typically something went wrong in the communication of the BOINC client, while talking to either the server, the application or the file-system of the host.

It can also happen:

When the complete string path is longer than 254 chars.
When the name of the file to be copied is wrong.
When the target path is wrong.
When the readonly attribute is set on the copied file or target folder.

Always report this error on the project's forums. The developers will want to know about it and fix it.