I can not print and I get the following message on my printer: 0x6101bed

If you have HP printer then follow these steps -
Reset the product
Without turning off the product, disconnect the USB cable from the rear of the product.
[NOTE:
The USB cable connects to the port on the rear of the product. The port is labeled with the USB icon (). If your printer has a network or wireless connection, ignore this step.
Description of disconnecting the USB cable.
Remove the cartridges from the product.
Wait until a message to insert the cartridges displays. If you do not see a message within a few minutes, skip to the next step.
NOTE:
If your printer does not have a display, wait until the cartridge lights blink. If the cartridge lights do not blink within a few minutes, skip to the next step.
Disconnect the power cord from the back of the product.
Wait 60 seconds.
Reconnect the power cord. If the product does not automatically turn on, press the Power button ().
Reinsert the cartridges, and then close any open doors on the product.
If you receive a prompt to print a calibration page, do so.
If you disconnected the USB cable, reconnect it to the rear of the product.
Try printing again.
 
you can get the detailed information at hp site visit here 
http://support.hp.com/us-en/product/HP-Officejet-7500A-Wide-Format-e-All-in-One-Printer-series---E9/4083647/model/4083648/document/c00489814