Conversion failed when converting the nvarchar value '/' to

Question

I have SQL query as following :

SELECT TOP (99.9999999) PERCENT CAST(CAST(LEFT(SpecialCode, CHARINDEX('/', SpecialCode) - 1) AS nvarchar) AS int) AS Expr1, CAST(CAST(RIGHT(SpecialCode, CHARINDEX('/', SpecialCode) - 6) AS nvarchar) AS int) AS Expr2, MemberCode, SpecialCode, StartingDate, JoinDate, EndDate, BirthDate, Name, FirstName, MiddleName, LastName, Nationality, Nationality2, Education, Address, City, Country, PostalCode,                           Homephone1, Homephone2, Workaddress, WorkPhone1, Ext1, WorkPhone2, Ext2, Mobile1, Mobile2, FaxNumber, Email, EmergencyTel, NoOfYearsTennis, ClubName, NationalRank, Year, class,                           NoOfYearsTournament, Note, MSRelation, RelatedMemberCode, MScategory, Member, ParentCard1, ParentCard2, ExpDate, position, worktype, NonActive, MSKind, MSType, CardNumber, CardReceived,                           Discount, Religious, Gender, Organization, RelatedMemberCodeOld, CreateUserId, CreateDateAndTime, UserId, DateAndTime, HasNotEmail, VillaOwner, Homephone3, Mobile3, Email2, Email3, BirthPlace,                           NationalNo, EndDateNationalNo, MiritialStatusID, WifeNo, GeneralAssembly FROM            dbo.Members WHERE (Member = 1) AND (SpecialCode IS NOT NULL) ORDER BY expr1, EXPR2

Field SpecialCode found in Members Table and have values like that

 

006403/1 when i run query above it give me error

 

Msg 245, Level 16, State 1, Line 1

Conversion failed when converting the nvarchar value '/' to data type int.

 

why and how to solve this error .