function query error: column does not exist

i've a function takes as argument some values of few types, and make some
INSERT operation using that values.
I've occour an error while calling that function, the error is on a varchar
variable.

this is the insert code:

>EXECUTE 'INSERT INTO table VALUES('||value1||','[...]','||value_char||')';

and the error is on value_char. pg told me that "column does not exist".
Why?

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