could not find the stored procedure

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C#

Dear all;
I am calling a stored procedure from a c# program and I keep having this error message :
'could not find the stored procedure sp_Trial'

C# codes are as follows
-----------------------

protected void btn_Add_Click1(object sender, EventArgs e)
{

try
{

// Connection to the database
//
//
string str;
str = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;
SqlConnection sqlCon = new SqlConnection(str);

// Call the stored procedure
SqlCommand sqlCmd = new SqlCommand("sp_Trial", sqlCon);
sqlCmd.CommandType = System.Data.CommandType.StoredProcedure;

// Create and supply the output parameters
sqlCmd.Parameters.Add("@LoanID", System.Data.SqlDbType.VarChar, 10);
sqlCmd.Parameters["@LoanID"].Direction = System.Data.ParameterDirection.Output;


// Open the sql data connection
sqlCon.Open();

// Execute the stored procedure
sqlCmd.ExecuteNonQuery();

lblstatus.Text = "Student details saved successfully";

// Assign the results to the controls
txt_Int_Code.Text = sqlCmd.Parameters["@LoanID"].Value.ToString();

//
//
sqlCon.Close();

}

catch (Exception ex)
{
lblstatus.Text = ex.Message;
}

Stored Procedure
-----------------

USE [COC_CREDIT]
GO
/****** Object: StoredProcedure [dbo].[sp_Trial] Script Date: 05/25/2014 12:22:20 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO


ALTER Procedure [dbo].[sp_Trial]
(
@LoanID	varchar(10) Output
)
As
Begin

Declare @SID Smallint

Select @SID = ISNULL(MAX(CONVERT(SMALLINT,SUBSTRING(INT_NO,4,6))),0) + 1 From INTEREST

Select @LoanID = 'INT' + REPLICATE('0',6 - LEN(@SID)) + CONVERT(VARCHAR(6),@SID)
End

Please help me to correct the error