I have been using on my MacBook for a very long time. There were no errors, nothing in my computer changed. Now it says CF_NO_NETWORK error and cannot connect. When İ uninstall and install it works once until I quit the program. After that, it is the same again: CF_NO_NETWORK. How can I fix that?

I am sure my computer is connected to the internet BTW.

If you have already checked that you are connected to a valid network, and that your device is retrieving a valid IP address, try rebooting your device or running your system’s network diagnostics tool.