Printer and printer control method

A printer comprising:

• a print mechanism that executes printing based on a printing job;
• a plurality of paper feeders that supplies paper to the print mechanism;
• a memory that correlates and stores the paper feeders and attributes of the paper held in the paper feeders;
• a controller that compares the attributes of the paper correlated with the paper feeders with attributes of the paper specified with a printing job to detect a mismatch error in which there is no paper feeder for which the attributes correlated therewith is consistent with the attributes specified with the printing job, and to display on a screen one of the paper feeders in which to place the paper specified with the printing job when the mismatch error is detected;
• and
• a sensor that detects paper sizes including paper widths and paper lengths among the attributes of the paper supplied to the print mechanism, wherein
• the controller further detects the attributes of the paper actually held in the one of the paper feeders, and compares the attributes of the paper actually held in the one of the paper feeders with the attributes of the paper specified with the printing job after the mismatch error is detected, and
• the controller further
• updates the attributes of the paper correlated to the one of the paper feeders to the attributes of the paper specified with a first printing job, when the paper sizes of the paper detected by the sensor and the paper sizes of the paper specified with the first printing job match,
• does not update the attributes of the paper correlated to the first paper feeder, when the paper sizes of the paper detected by the sensor and the paper sizes of the paper specified with a second printing job do not match, and the paper sizes of the paper detected by the sensor and the paper sizes stored in the memory match, and
• does not update the attributes of the paper correlated to the one of the paper feeders and displays on a screen the attributes of the paper specified with the printing job, when the paper sizes of the paper detected by the sensor and the paper sizes of the paper specified with a third printing job do not match, and the paper sizes of the paper detected by the sensor and the paper sizes stored in the memory do not match.