Not able to insert data into table

Hi Team,
I have written 1 function (return void) for inserting data into table .
This function is compiled successfully but in running process it raised a exception .
I have tried same process with 1 new function that return some int4 value than function running successfully.
So I want to know if definition part of function is same in both the function than why I am getting these exceptions?
Please share some solution that I can use in my function.

Regards,
Shruti Gupta

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