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Support Article

Saving a ruleset throws 'an operator does not exist' error



The error: "pyComponentInterfaceClass: "OperatorID" doesn't exist or is not a valid entry or this ruleset and its prerequisites" occurs when attempting to save a ruleset in Pega 7.1.7.

Error Messages

pyComponentInterfaceClass:OperatorIDXXXXX doesn't exist or is not a valid entry for this ruleset and its prerequisites

Steps to Reproduce

Save a ruleset version in chrome browser.

Root Cause

A defect in Pegasystems’ code. The issue is specific to chrome browser.


Perform the following local change:

Open URL in 'incognito mode' in chrome.
Use an alternative browser.

It is scheduled to be fixed in the Pega 7.1.10 release.


Published October 13, 2015 - Updated October 8, 2020

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