Cannot create call using the web sdk

I'm trying to create a call using the web SDK but im getting this error "Couldn't Get Call Resources. Error: Cannot read properties of null (reading 'replace')"

im only sending this as the payload
{"assistantId":"4","assistantOverrides":{"variableValues":{"username":"taha","company_description":"","job_description":"foobar","custom_questions":null,"job_title":"Software Engineer","lang":"en"},"responseDelaySeconds":0,"llmRequestDelaySeconds":0,"metadata":{"interviewId":"123"},"serverUrl":"https://894a-206-42-122-82.ngrok-free.app/v1/interviews/callback"}}
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