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pymysql.err.InternalError: (1054, "Unknown column '[field_name]' in 'field list'")

I have created a custom doctype with child table .
In custom script i added code for
1.updating a parent field based on some other parent field using frm.set_value()
2.Adding Child table rows

While saving form pymysql.err.InternalError: (1054, “Unknown column ‘[field_name]’ in ‘field list’”) error occurs

dear Navya_shree,

could you give code for

The problem is solved, there was an error in adding child table row code.

Thank you