I checked all the answers provided here. Everyone said to disable the "Send anonymous usage statistics" checkbox in the settings ....
I think hiding the problem does not solve the problem . Since there was a new version of PageRuler (I had 2.1.2 , the newest one is currently 2.1.3 ), I uninstalled the old one, reinstalled the new one and from now on, regardless of whether I send statistics or not, the error is not appaers anymore.
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