Msg 402, Level 16, State 1, Procedure test, Line 26 The data types varchar and date are incompatible in the add operator.

alter  procedure test 
 (
 @t1 varchar(50),

@emplrid  varchar(15),
@emp_doj date,
@emp_desg varchar(50),
@emp_type varchar(50),
@emp_locid varchar(15),
@dept_id varchar(50),
@emp_reportingto varchar(50),
@emp_batchno varchar(50),
@emp_cardno varchar(50),
@emp_weekoff varchar(50),
@emp_ctc varchar(50),
@emp_opngctc varchar(50),
@cdate date,
@esi_subcode varchar(50),
@emp_id varchar(15)
)
 as
 begin
 
 DECLARE @SQL varchar(250)
 
 SELECT @SQL = 'insert into ' + @t1 + ' values ('''+@emp_id+''','''+@emplrid+''','+@emp_doj+','''+@emp_desg+''','''+@emp_type+''','''+@emp_locid+''','''+@dept_id+''','''+@emp_reportingto+''','''+@emp_batchno+''','''+@emp_cardno+''','''+@emp_weekoff+''','''+@emp_ctc+''','''+@emp_opngctc+''','+@cdate+','''+@esi_subcode+''')'
 
 EXEC (@SQL)
    
 end 

Msg 402, Level 16, State 1, Procedure test, Line 26
The data types varchar and date are incompatible in the add operator.