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Hi Michi,
The “Cannot read properties of undefined (reading 'getLineCount')” error may indicate a temporary issue with the Agentforce/Builder interface or the current Playground configuration.
Please try refreshing the page, signing out and back in, or opening the Playground in an incognito/private browser window. Also, make sure all the required setup steps for the challenge have been completed before creating the subagent.
If the issue persists, please share more details about the steps you followed and a screenshot of the error so the issue can be investigated further. If needed, you can also create a Salesforce Support case for additional assistance
