The brother dcp-l2540dw offline error is popping up constantly falling for a variety of causes, including: • Blockage of the ink toner • The printer isn't set to be the default. • A network connection error has occurred between your computer and printer. • Due to a print job that is stalled in the queue • Printer drivers that are corrupted or out of date. • If the printer's 'use offline mode' option is chosen, the offline error may appear. • The printer settings are incorrect.