Unwanted Dialogue Box

[Alan Pearce]

Help please!
    
I am in Open Office Calc and a dialogue box has kept appearing saying "The 
document you are about to export has one or more protected items with password 
that cannot be exported. Please retype your password to be able to export your 
document" I AM NOT TRYING TO EXPORT MY DOCUMENT. WHAT'S MORE IT MUSN'T BE 
EXPORTED. I have managed to delete it by pressing cancel about 3 times but now 
the box won't go away however many times I press cancel. Any ideas please?Alan.