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Gokul DaghaleGokul Daghale 

having this issue

IFHXRXQT
SwethaSwetha (Salesforce Developers) 
HI Gokul,
It looks like an error that occurred when doing a trailhead challenge. It is similar to GACK Ids that occur in Salesforce org.

We have a separate Trailhead team who can help you with these issues. So, can you please use the below link to reach out to them so that one of the Engineers will get in touch with you.
Support: https://trailhead.salesforce.com/en/help?support=home

Please mark this answer as best if it helps so that others facing the same issue will find it useful.Thanks