Canon EOS 5D Mark IV Instruction Manual page 164

Responding to Error Messages
125: Check the network settings
Is the network connected?

Check the connection status of the network.

126: Could not connect to server
CANON iMAGE GATEWAY is under maintenance or load is

concentrated temporarily.
Try connecting to the Web service again later.

127: An error has occurred
A problem other than error 121 to 126 occurred during the

connection to the Web service.
Try connecting to the Web service again.

141: Printer is busy. Try connecting again.
Is the printer performing a printing process?

Connect to the printer again after the printing process is finished.

Is another camera connected to the printer?

Connect to the printer again after the connection between the

printer and the other camera has been terminated.
142: Could not acquire printer information. Reconnect to
try again.
Is the power of the printer on?

Connect to the printer again after turning on the printer.

164