Append Query error - tried to assign null value to a variable that is not a variant data type [Anwsered]

Append Query error - tried to assign null value to a variable that is not a variant data type

I am trying to archive some older data in my Fleet Maintenance data base.  I want to archive the data on all Sold Assets OR anything that is greater than my parameter given number of months AND less than $1000.   I've written the Archive query below, changed
it to an Append query.  Written the Delete Query, changed it to a Delete Query.  Wrote the Macro to run it.
When I run the Macro I get the error "You tried to assign the Null value to a variable that is not a Variant data type.
I am assuming that it is the Where (((Assets.[Sold Date]) Is Not Null))  that is causing the error.  In the table it has Date/Time as the Data Type and the Text Align is General.  
I've searched until my eyeballs are bleeding and I think I need to possibly convert it to a Variant in the query but I'll be blessed if I can figure out how.
I'm using Access 2007, know just enough SQL to be dangerous and enough VBA to copy lines of code well.  Help??
Archive Query:
PARAMETERS MonthsAgo Short;
INSERT INTO Maintenance_archive ( [PO Number], [Number], [Purchase Order Date], [Asset Description], Category, Description, Mileage, Vendor, [Estimated Cost], Disputed, [Invoice Number], [Vice President Approval], [Void Purchase Order Date], [System Date] )
SELECT Maintenance.[PO Number], Maintenance.Number, Maintenance.[Purchase Order Date], Maintenance.[Asset Description], Maintenance.Category, Maintenance.Description, Maintenance.Mileage, Maintenance.Vendor, Maintenance.[Estimated Cost], Maintenance.Disputed,
Maintenance.[Invoice Number], Maintenance.[Vice President Approval], Maintenance.[Void Purchase Order Date], Maintenance.[System Date]
FROM Assets LEFT JOIN Maintenance ON Assets.Number = Maintenance.Number
WHERE (((Assets.[Sold Date]) Is Not Null)) OR (((Maintenance.[Invoice Amount])<1000) AND ((Maintenance.[Invoice Date])
Delete Query: 
PARAMETERS MonthsAgo Short;
DELETE Assets.[Sold Date], Maintenance.[PO Number], Maintenance.Number, Maintenance.[Purchase Order Date], Maintenance.[Asset Description], Maintenance.Category, Maintenance.Description, Maintenance.Mileage, Maintenance.Vendor, Maintenance.[Estimated Cost],
Maintenance.[Invoice Amount], Maintenance.Disputed, Maintenance.[Invoice Number], Maintenance.[Invoice Date], Maintenance.[Vice President Approval], Maintenance.[Void Purchase Order Date], Maintenance.[System Date]
FROM Assets LEFT JOIN Maintenance ON Assets.Number = Maintenance.Number
WHERE (((Assets.[Sold Date]) Is Not Null)) OR (((Maintenance.[Invoice Amount])<1000) AND ((Maintenance.[Invoice Date])Macro:
OpenQuery, Archive Query, Datasheet, Edit
OpenQuery, Delete Query, Datasheet, Edit

Solutions to the Problem Append Query error - tried to assign null value to a variable that is not a variant data type

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In this expression:
  DateAdd("m",-[MonthsAgo],DateSerial(Year(Date()),Month(Date()),1))));
I would expect [MonthsAgo] to be an integer.
You are using a LEFT JOIN (I think) in your query.
Is there a particular reason for this since it might be pulling null values into a required field.

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