Cascading choices can only reference one choice list - Form Builder

I want to add a cascade choice question in my survey. I am using formbuilder for the same. I am not able to shake off this error. Please help me out

cascading choices can only reference one choice list

Welcome to the community, @Benstin! This support article Adding Cascading Select Questions should help you design a cascading select question in Kobotoolbox.

Thank you @Kal_Lam.

I have tried following the steps. However, the same issue persists. I have tried to identify the rows which is causing this issue. The issue arises from the rows 76 to 84. I am unable to identify what exactly is the issue in those rows.

Please help me out. I am attaching the file here for your reference

cascading choices can only reference one choice list