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Why does sage say that there is an error when I type a command and run it? (even I run 1+1, the error appear)

Here is how sage says:

ERROR: 'closed'

Communication with the Sage server is failing.

Here are some actions you could try to resolve this problem: - check your internet connection, - run this cell again, - close and reopen this file, - restart the project (in project settings, wrench icon), - reload the browser tab or even restart your browser, - delete some of the content in the project's ~/.local directory, (locally installed Python libraries might interfere with running this worksheet)

Why does sage say that there is an error when I type a command and run it? (even I run 1+1, the error appear)

Here is how sage says:

ERROR: 'closed'

Communication with the Sage server is failing.

Here are some actions you could try to resolve this problem: - check your internet connection, - run this cell again, - close and reopen this file, - restart the project (in project settings, wrench icon), - reload the browser tab or even restart your browser, - delete some of the content in the project's ~/.local directory, (locally installed Python libraries might interfere with running this worksheet)