In Trigger getting error as error converting data type varchar to numeric

I have a trigger which was working earlier perfectly. But later on, as required I added some more lines into that which is below

declare @imkey numeric(10,0);declare @xmkey numeric(10,0); declare @xsrno numeric(10,0)
            select  @xmkey=max([Mkey])+1, @xsrno=max([Entry_Sr_No])+1 
            from erp190516.[dbo].[Inward_Doc_Tracking_Trl] where Ref_Mkey=@imkey;
            select @imkey=i.Inward_ref_key from inserted i 

            insert into erp190516.[dbo].[Inward_Doc_Tracking_Trl]
            SELECT  @xmkey,@xsrno,[N_UserMkey],'1' [N_Department], 'F' [CStatus_Flag]
            ,'Requester' [Remarks],'1' [CUser_ID],getdate() [U_Datetime],
            ,'N' [NStatus_Flag], 'N' [Delete_Flag]
            ,'1'[CDept_Id],[Ref_Mkey],[No_Of_Days],[Approved_Amount],[Chq_No],[Chq_dated]
            ,[Chq_Bank],[Chq_Amount],[Vendor_MKey],[Vendor_Comp_Mkey]
            ,[Project_Mkey],[Program_mkey],[Payment_MKey],[Due_Date],[Updated_Remarks]
            ,[Updated_Bill_no],[Updated_Bill_Date],[Updated_Bill_Amt]
            ,[Party_Name],[Acc_mkey],[TotalDeductions],[Broker_Mkey],[Customer_Mkey]
            ,[Payable_Amt],[Balance_Amt],[Receipt_No],[Po_No],[Bill_No]
            ,[Disp_through],[Disp_Through_Name],[Site_Id]
        FROM erp190516.[dbo].[Inward_Doc_Tracking_Trl] where Ref_Mkey=@imkey

It eexcuted perfectly, but while inserting the data into the table I got error as

Error converting data type varchar to numeric