fix error: _pickle.UnpicklingError: invalid load key, 'v'. (#1966)

YC

2024-07-29 259343dda5a4589f067dc4af5edf165101303845

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<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "self:">
   </FileRef>
</Workspace>