Attempt to invoke interface method 'int java.util.list.size()' on a null object reference

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Many thanks for your support, I got the solution from ODK forum.

I used below mentioned search function with select one option question and the options were defined in the choices sheet. while the search functions are used to load choices from external csv files.

Row 9: search('n_districts', 'matches', 'province_id', ${province_id})
Row 10: search('n_tehsils', 'matches', 'district_id', ${district_id})

Thanks

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