Error In Updating Field Thru Stor_proc

I'm trying to update 'password' field in a table thru a stored procedure which is called from my program.

I'm passing the values for password and the key fields.

While debugging I can see the values in each parameter, but I get an error that the 'value for password was not passed'.

Here's the program snippet for calling the stored proc.

All three parameters are 'varchar' type

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dbConn.Open();

dbConn.CreateParameters(3);

dbConn.AddParameters(0, Pwd, newPwd);

dbConn.AddParameters(1, Login, pwd_Login);

dbConn.AddParameters(2, IdNum, pwd_IdNum);

result = dbMgr.ExecuteNonQuery(CommandType.StoredProcedure, SP_UPDPWD);

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EXEC @return_value = [dbo].[usp_UsrMstUpdPwdParaPwdEmailCaseNum]

@Pwd = N'3Sg7vqowIBRdfgdfgrgdjykFTjTFt5hfHfhFtFghzIG1haWRliBuYW1lPw==',

@Login = N'xyz@abc.com',

@IdNumber = N'00009'



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What am I missing?