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Error creating Custom Connector from Postman Collection: cannot read properties of undefined (reading 'tostring')



I'm trying to create a custom connector in Power Automate, by using a Postman collection from ActiveCampaign (api documentation: Or find the file here as I cannot attach JSON files to this message: ActiveCampaign API v3.postman_collection.json


When importing the JSON file to create the Custom Connector, I get this error: 

Cannot read properties of undefined (reading 'toString'). 


I have no clue what the problem here is, and how to fix it. Can someone help? I haven't found any solutions so far.



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