Getting error in (utf8_general_ci,COERCIBLE) for operation 'replace' MYSQL

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MySQL

CREATE PROCEDURE StudentMessage_Insert(  
	_regno VARCHAR(8000),
	_regnoCount INT,
	_isEmail int,
	_isSMS int,
	_isParent int,
	_isStudent int,
	_message text,
	_msgfrom varchar(100),
	_filePath1 varchar(200),
	_filePath2 VARCHAR(200),
	_filePath3 VARCHAR(200),
	_messageTitle VARCHAR(200) 
    )
BEGIN
    DECLARE xx  INT;
    DECLARE regnoTemp  nvarchar(100);
    DECLARE _tmpMsg  TEXT;
    DECLARE _PrtUC varchar(100);
     
    if (_isStudent = 1) then 
       SET xx = 0;
               
        WHILE xx  < _regnoCount DO            
            SET  xx = xx + 1; 
            -- SELECT SPLIT_STRING(_regno, ',', xx);
            SELECT SPLIT_STRING(_regno, ',', xx) into regnoTemp;
           set _tmpMsg = _message;
            -- Error is in All Replace Keywords - Setting up the Message Tokens 
            SET _tmpMsg = replace(_tmpMsg, '{regno}', regnoTemp );
            SET _tmpMsg = replace (_tmpMsg, '{StudentName}', fn_getStudentName(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{ParentName}', fn_getFatherNameByStudentUserCode(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{StaffName}', fn_getNameByUserCode(_msgfrom) ); 
            SET _tmpMsg = replace (_tmpMsg, '{ClassName}', fn_getClassNameByUserCode(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{SectionName}', fn_getSectionNameByUserCode(regnoTemp) );              
            
            CALL Student_InsertTimeLine(regnoTemp, _msgfrom, regnoTemp, 'Message',_messageTitle, _tmpMsg, NOW());
           
            insert into message(msgFrom,msgTo,regno,messageBody,filename1,filename2,filename3,isSMS,isEmail,messageDate)
                values ( _msgfrom,regnoTemp,regnoTemp,_tmpMsg,_filePath1,_filePath2,_filePath3,_isSMS,_isEmail, NOW());
                    
        
        END WHILE;
    end if;
          
    IF (_isParent = 1) THEN 
       SET xx = 0;
               
        WHILE xx  < _regnoCount DO                            
            SET  xx = xx + 1; 
                -- SELECT SPLIT_STRING(_regno, ',', xx);
                SELECT SPLIT_STRING(_regno, ',', xx) INTO regnoTemp;
            set _tmpMsg = _message;
            -- Error is in  All Replace Keywords - Setting up the Message Tokens 
            SET _tmpMsg = replace(_tmpMsg, '{regno}', regnoTemp );
            SET _tmpMsg = replace (_tmpMsg, '{StudentName}', fn_getStudentName(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{ParentName}', fn_getFatherNameByStudentUserCode(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{StaffName}', fn_getNameByUserCode(_msgfrom) ); 
            SET _tmpMsg = replace (_tmpMsg, '{ClassName}', fn_getClassNameByUserCode(regnoTemp) ); 
            SET _tmpMsg = replace (_tmpMsg, '{SectionName}', fn_getSectionNameByUserCode(regnoTemp) );    
            
            SET _PrtUC = fn_getParentUCByStudent(regnoTemp);           
            
            CALL Student_InsertTimeLine(regnoTemp, _msgfrom, _PrtUC, 'Message', _messageTitle,_tmpMsg, NOW()); 
            
                        
            INSERT INTO message(msgFrom,msgTo,regno,messageBody,filename1,filename2,filename3,isSMS,isEmail,messageDate)
                VALUES ( _msgfrom,_PrtUC,regnoTemp,_tmpMsg,_filePath1,_filePath2,_filePath3,_isSMS,_isEmail, NOW());      
                
                
        END WHILE;
    END IF;         
          
    END; 

CALL StudentMessage_Insert ('UA12','1','1','0','1','1','Today will be holiday due to dynamic.','AD11','','','','Important Notice')

I am getting this ERROR:

SQL execution error #1270. Response from the database:
Illegal mix of collations (latin1_swedish_ci,IMPLICIT),
(utf8_general_ci,COERCIBLE), (utf8_general_ci,COERCIBLE) for operation
'replace'