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When uploading a zip with custom objects, layouts, profiles, and permission sets the Metadata API returns the following error.

UNKNOWN_EXCEPTION: An unexpected error occurred. Please include this ErrorId if you contact support: 1123676363-XXXXX (-1340066242)

The zip file is generated by a tool and works for other orgs. The zip uses UTF-8 as the alternate filename encoding. What are possible causes for a zip upload failure?

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Salesforce support can assist with reporting on the details of this error to find a cause.

They reported that the exception was MalformedInputException during the decompression of the zip. On further inspecting the files, a profile name had a non-ASCII character, ü, in it. After removing the special character from the name of the profile, the zip uploaded successfully. I asked them to report this as an issue.

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