Getting "function doesn't exist" in devart while calling postgres stored procedure

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PostgreSQL

I am trying to call postgres stored procedure using DevArt library.
I am getting the error message as "function doesn't exist 0x80004005".

Though I am calling stored procedure its returning as a function doesn't exist in error message. Could you please help me out.

here is the code snippet.

Protected int ExecuteNonQuery(CommandType commandtype,string commandtext,params IDbDataParameter[] parameters)
{
using (var dbConnection=GetDbConnection())
{
using (var dbCommand=dbCommand.CreateCommand())
{
dbcommand.CommandText="StoredprocedureName";
dbcommand.CommandType=commandType;//commandType will be passed as StoredProcedure
dbcommand.parameters.AddRange(parameeters);
int result=dbcommand.ExecuteNonQuery();
}
}

What I have tried:

Verified all the stored procedures.