Canon EOS REBEL T7I Wi-Fi (Wireless Communication) Function Instruction Manual page 150

Responding to Error Messages
127: An error has occurred
A problem other than error code number 121 to 126 occurred

during the connection to the Web service.
Try re-establishing the Wi-Fi connection to the Web service.

141: Printer is busy. Try connecting again.
Is the printer performing a printing process?

Try again to establish the Wi-Fi connection to the printer after the

printing process is finished.
Is another camera connected to the printer via Wi-Fi?

Try again to establish the Wi-Fi connection to the printer after the

Wi-Fi connection to the other camera has been terminated.
142: Could not acquire printer information. Reconnect to
try again.
Is the power of the printer on?

Try again to establish the Wi-Fi connection after turning on the

printer.
150