so and after i learned the answer,i shortened the length of column names.
old name : U_DISMECHANISM (12 ch except U_) (****)
new name : U_DISMECH (7 ch except U_) (****)
**** both of them are string textbox , namely not combobox or checbox field.
Although I changed the length of column names, i am still getting error :(
What is the reason of this issue ?
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