£30 have you checked the scratch serial number Yet?
Is yours OK Now?
If you get the error again, you have to do the following:
Take the tank off the mod
Fire the mod - you'll get a message saying 'No Atomizer' or similar
Put the tank back on the mod
Fire the mod - it will ask if you're using a new coil. Select 'Yes'
Vape away!
Depends how much you are using it, what power, and how much juice you're getting through