UPM fails to upgrade plugins with Unexpected token message on console

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Platform Notice: Server and Data Center Only. This article only applies to Atlassian products on the server and data center platforms.

Summary

Sometimes UPM fails to upgrade plugins and a popup error message appears. It says it failed and to check the Confluence logs but the logs have no errors.

Environment

Confluence 7.x

Diagnosis

Open the browser’s console and try to upgrade a plugin. You will observe the following message:

Failed to parse response text: SyntaxError: Unexpected token U in JSON at position 0


Cause

The "Unexpected token U in JSON at position 0" is a typically Javascript error that will show up in your console log if the client has been directed to execute JSON.parse() on a string beginning with u instead of a stringified object. "u" is typically a stringified version of the undefined primitive.

Solution

  1. Clear the browser's cache or use the incognito mode
  2. Try to upgrade the plugins again


Last modified on Jun 24, 2022

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