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1 Antwort
You posted this in the NPSP group so first question... are you a System Administrator? If so, when you go to Setup > Object Manager > Leads > Buttons, Links and Actions and click the drop down to the right and "Edit" what do you see under "Salesforce Classic Override"?
In terms of NPSP "coaching clients" isn't something out of the box, so you will need to provide more information on your lead conversion process. Does this error only happen with certain leads? If so, what makes these different?