How Can I Fix - Data Validation from another Workbook errors?

Data Validation from another Workbook errors

I am pretty new to creating a data validation from another workbook but I have read through a ton of articles and tutorials and still can't seem to get mine to work - help!? The two workbooks in question can be found here:

https://www.dropbox.com/sh/x0x01xwmtpv92aj/AAADgr3pPJCMsmGZo9wS1Lbba
I am trying to create a dropdown list in the Group Health Spreadsheet workbook from the MEDPLANS workbook.
I have defined a name for the range that I want to include in my list from the MEDPLANS spreadsheet.
The Range is A2 to A135 and I have named this
range PlanListSource.
In the Group Health Spreadsheet I tried to define a new List called PlanList and have it refer to:=[MEDPLANS.XLS]Database!PlanListSource
Excel seems to accept this and so I then move to the Data Validation step starting in Cell C4.
In the Data Validation screen I select List in the "Allow" field and put the Source as:=PlanList
Again this seems to work fine as then I can view my list of data but if I click on a different cell and then come back to cell C4 I get a run-time error message (re: column width), then Excel shuts itself down and I am back to square 1.
I put a copy of the
error message in my dropbox file with the workbooks.
I am just not sure where to go from here or how to fix this - help!

Keys to the Problem Data Validation from another Workbook errors

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