Sqlcommand executenonquery throws exception system.invalidcast

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C#

ASP.NET

i am inserting data into the database from c# asp.net using stored procedure. I have used data access class library to insert the data in which at the last i am getting this error mention in the question at executenonquery method. in this method the value is zero also. I will send the stored procedure and data access class library. please correct me where i am doing wrong

What I have tried:

Stored Procedure:

CREATE PROCEDURE [dbo].[usp_Student_InsertOrUpdateStudentDetails]
(
	@guidStudentId			UNIQUEIDENTIFIER,
	@chvStudentName			VARCHAR(50),
	@chvAccessLevel			VARCHAR(50),
	@dateEntryDate			DATETIME,
	@chvEmailAddress		VARCHAR(200),
	@chvPhone				VARCHAR(10),
	@chvPasswordHash		VARCHAR(MAX),
	@guidRegisterationsId	UNIQUEIDENTIFIER,
	@guidCreatedBy			UNIQUEIDENTIFIER,
	@dateCreatedDate		DATETIME,
	@chvOutMessage			VARCHAR(1000) OUTPUT
)
AS

BEGIN

	SET NOCOUNT ON;

		SET @guidStudentId = NEWID()
		SET @dateCreatedDate = CONVERT(varchar(10),GETDATE(),105)
		
		IF NOT EXISTS(SELECT '*' FROM Student where StudentId = @guidStudentId)
		BEGIN			

			INSERT INTO	Student(StudentId, StudentName, AccessLevel, EntryDate, EmailAddress, Phone, PasswordHash, RegisterationsId, CreatedBy, CreatedDate)
			VALUES (@guidStudentId, @chvStudentName, @chvAccessLevel, @dateEntryDate, @chvEmailAddress, @chvPhone, @chvPasswordHash, @guidRegisterationsId, @guidCreatedBy, @dateCreatedDate)
			
			SET @chvOutMessage = 'SUCCESS INSERTED INTO STUDENT TABLE'

			INSERT INTO Users(UserId,StudentId,UserName,Password,UserType,IsSuperUser,CreatedBy,CreatedDate)
			VALUES (NEWID(),@guidStudentId,@chvStudentName,@chvPasswordHash,@chvAccessLevel,'False',@guidCreatedBy,@dateCreatedDate)

			SET @chvOutMessage = 'SUCCESS INSERTED INTO USERS TABLE'
			
		END
		ELSE
		BEGIN

			UPDATE	Student SET
					ModifiedBy		= @guidStudentId,
					ModifiedDate	= @dateCreatedDate,
					IsActive	= 0
			WHERE	IsActive	= 1 
			AND		StudentId	= @guidStudentId

			SET @chvOutMessage = 'SUCCESSFULLY UPDATED STUDENT DETAILS'

			UPDATE	Users SET
					ModifiedBy		= @guidStudentId,
					ModifiedDate	= @dateCreatedDate					
			WHERE	StudentId	= @guidStudentId

			SET @chvOutMessage = 'SUCCESSFULLY UPDATED USERS DETAILS'

		END

END

Data Access Library code:

public StudentBO InsertOrUpdateStudentDetails(StudentBO objStudentBO)
        {
            SqlConnection con = new SqlConnection(DbBridge.DbConnection);

            try
            {
                con.Open();

                SqlCommand cmd = new SqlCommand(INSERT_OR_UPDATE_STUDENT_DETAILS, con)
                {
                    CommandType = CommandType.StoredProcedure
                };

                cmd.Parameters.AddWithValue("@guidStudentId", objStudentBO.StudentId);
                cmd.Parameters.AddWithValue("@chvStudentName", objStudentBO.StudentName);
                cmd.Parameters.AddWithValue("@chvAccessLevel", objStudentBO.AccessLevel);
                cmd.Parameters.AddWithValue("@dateEntryDate", objStudentBO.EntryDate);
                cmd.Parameters.AddWithValue("@chvEmailAddress", objStudentBO.EmailAddress);
                cmd.Parameters.AddWithValue("@chvPhone", objStudentBO.Phone);
                cmd.Parameters.AddWithValue("@chvPasswordHash", objStudentBO.PasswordHash);
                cmd.Parameters.AddWithValue("@guidRegisterationsId", objStudentBO.RegisterationsId);
                cmd.Parameters.AddWithValue("@guidCreatedBy", objStudentBO.CreatedBy);
                cmd.Parameters.AddWithValue("@dateCreatedDate", objStudentBO.CreatedDate);
                cmd.Parameters.AddWithValue("@chvOutMessage", OUTMESSAGE_SIZE);

                int k = cmd.ExecuteNonQuery();
                if (k == 1)
                    objStudentBO.OutMessage = cmd.Parameters["@chvOutMessage"].Value.ToString();
            }

            catch (Exception ex)
            {
                throw ex;
            }

            finally
            {
            }
            return objStudentBO;
        }

where private const string INSERT_OR_UPDATE_STUDENT_DETAILS = "usp_Students_InsertOrUpdateStudentsDetails";

Getting error at int k = cmd.ExecuteNonQuery();