Conversion error in stored procedure

AS
BEGIN
SET NOCOUNT ON
declare @set varchar(200),@query varchar(500),@where varchar(100)
SET @set=' ';
SET @where='WHERE ';

IF @FileID!=0
BEGIN
if(@Passport IS NOT NULL)
BEGIN
SET @set=@set+' Passport='+@Passport
END
if(@Visa IS NOT NULL)
BEGIN
SET @set=@set+' Visa='''+@Visa+'''';
END
if(@EmiratesId IS NOT NULL)
BEGIN
SET @set=@set+' EmiratesId='+@EmiratesId
END
if(@LabourCard IS NOT NULL)
BEGIN
SET @set=@set+' LabourCard='+@LabourCard
END
IF (@Photo IS NOT NULL)
BEGIN
SET @set=@set+' Photo='+@Photo;
END
IF(@Signature IS NOT NULL)
BEGIN
SET @set=@set+' Signature='+@Signature
END
SET @query='UPDATE tblEmpFiles SET '
SET @where=@where+' FileId='+@FileId;
SET @where=@where+' AND Status=1';
SET @query=@query+@set+@where;
PRINT(@query)
EXEC(@query);
END

ELSE

BEGIN

INSERT INTO tblEmpFiles(EmpId,Passport,Visa,EmiratesId,LabourCard,Photo,Signature,Status) VALUES(@EmpId,@Passport,@Visa,@EmiratesId,@LabourCard,@Photo,@Signature,@Status)

END

--SELECT SCOPE_IDENTITY() AS [SCOPE_IDENTITY];

END