You're seeing this page because SumatraPDF crashed.
You should see a Notepad opened with crash report file.
Help us improve SumatraPDF by submitting a crash log:
- you'll need GitHub account
- post the content of the crash log as a gist at https://gist.github.com/. For example:
Ctrl-Ato select all text,
Ctrl-Cto copy it to a clipboard and then
Ctrl-Vto the gist
- create a bug report at https://github.com/sumatrapdfreader/sumatrapdf/issues
- post a link to the gist in the bug report