Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 436)

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68: Cannot connect to wireless LAN terminal. Retry from the
beginning.
z Did you hold down the access point’s WPS (Wi-Fi Protected Setup)
button for the specified period of time?
B Hold down the WPS button for the period of time specified in the
access point’s instruction manual.
z Are you trying to establish a connection near the access point?
B Try establishing the connection when both devices are within reach
of each other.
69: Multiple wireless LAN terminals have been found. Cannot
connect. Retry from the beginning.
z Connection is in progress by other access points in Pushbutton
Connection mode (PBC mode) of WPS (Wi-Fi Protected Setup).
B Wait a while before trying to establish the connection.
91: Other error
z A problem other than error code number 11 to 69 occurred.
B Turn the camera’s power switch off and on.
121: Not enough free space on server
z The target Web server does not have enough free space.
B Delete unnecessary images on the Web server, check the free
space on the Web server, then try sending the data again.