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Support Article

Error message after logging in



When developers attempt to log in, they first receive an error: Invalid Expression or Reference. When they refresh, they are able to load the developer screen but portals do not launch, and the Launch drop-down does not render.

Error Messages ** Invalid expression or reference: No suitable instance found [seeking]  @(null:null).isBrowserRequestor(PublicAPI) [candidate functions are]  Invalid expression or reference: No suitable instance found [seeking]  @(null:null).isChildRequestor(PublicAPI) [candidate functions are]  Invalid expression or reference: error: [email protected]isChildRequestor(tools) not correctly formed, TYPE BOOLEAN is required 
    at com.pega.pegarules.priv.FUAUtil.activityPreTranIndeterminateConditionalCheck(
    at com.pegarules.generated.activity.ra_action_initialprofilesetup_5378db0674010566c3c94982a4f00ff0.step4_circum0(

Steps to Reproduce

Log in to the developer environment with any credentials.

Root Cause

A defect in Pegasystems’ code or rules: The affected activity, InitialProfileSetup, was compiled and attempted to reference the Rule-Utility-Function (RUF) isChildRequestor while the owning library was being compiled. As a result, an error was inserted into the compiled code for the activity.


Make the following change to the operating environment:

Use the Systems Management Application (SMA) tool to delete the existing VTable entry for the activity InitialProfileSetup.

The next reference to the activity will then correctly generate the compiled code since the RUF is in the library and available.


Published July 26, 2018 - Updated December 2, 2021

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