I am using OpenCTI to screenpop the contact. But I am getting Failed to process API response error written in console. The weirdest thing is this is working in 2 other accounts and not in 3 accounts.

This is my code

sforce.interaction.searchAndGetScreenPopUrl(phoneNumber, 'Key1=value1', 'inbound', callBackFunction);

Is there something I have to do to make it work in all accounts ?