You must be busy doing your work and suddenly you come across the error Brother dcp-l2540dw offline. The error is caused due to paper jam, wrong printer configuration, or wrong default printer settings. Other reasons include drivers for printers that are corrupted or out of date or issues with ink toner. If the brother printer's 'use offline mode' option is selected, the offline error may also be shown. A problem with the network connection between your computer and printer.