Delete method failed - error 1004

[Marbles]

Hi, I have been making a spreadsheet and am trying to delete a row through VBA code. To delete the row i call the following function:

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however when i run the code i get an error occur on the line:

ActiveSheet.Range("D12").EntireRow.Delete

the error message is:

Run-time error '1004': Delete method of Range class failed.

i've looked on other sites to try find out why this is, but haven't had much luck. Does anyone know what could be the problem?

Thanks for any help.

[Marbles]

Nevermind now, i have resolved it. I feel silly for missing the obvious, but it was just the spreadsheet was protected