Clear Method Range Class Failed - Combobox Code

I have two separate workbooks, the first is called Job test and is to be used as a template for quoting jobs, the second is called Fixtures and is a database of fixtures that are organized in table. I keep them separate as multiple jobs will use the Fixtures DB workbook and I want to be able to update it and add new fixtures in one area. In order to facilitate this I have a macro that opens the Fixtures DB workbook anytime that the Job test workbook is opened. In the Job test workbook I have multiple dropdowns that I hope to make dependent or cascading by means of filtering the Fixtures DB workbook. The issue I have run into is with the following code.

Code:
Private Sub CLightType_Change()'Filters LampType
Workbooks("Fixtures.xlsm").Sheets("CLampType").Activate
Workbooks("Fixtures.xlsm").Sheets("CLampType").Cells.Clear
Workbooks("Fixtures.xlsm").Sheets("Fixtures").Cells.AdvancedFilter Action:=xlFilterCopy, CriteriaRange _
:=Workbooks("Job test.xlsm").Sheets("Criteria").Range("A1:A2"), CopyToRange _
:=Range("A1"), Unique:=False
[Code] ......

What this code hopes to achieve is that when I change the value in the LightType dropdown, the Fixtures DB workbook will automatically filter the data once to a different sheet(CLampType), then get only unique values for LampType in column O. I have set up a dynamic range for column O so as to populate my next combobox, LampType.

This should all be fairly simple and straightforward, however I am running into "Run-time error '1004': Clear method of Range class failed." when I try to execute the line to clear the worksheet, and also have an error when I try to filter the data via macro. The strange part is all of this can be done manually without a problem, and moreover I have tried recording the process and using the recorded version. Even stranger yet is that when I add an "on error resume next" before everything, the code works fine but keeps looping and acts finicky(I don't want to simply resort to this as a solution). I have also tried setting this macro up inside the Fixtures workbook instead and calling it from the combobox change, to no avail.