I have run across this error as well. I think I was able to trace it back to https://trac.sagemath.org/ticket/29411.
Running 'make build' on that ticket's commit in the develop branch (0bcd001f760ff724832c32b4f65fa575fd82e000 make sagelib a script package) produces the error for me whereas doing so on the immediately previous commit (10fb62408a9761bf91a95d9eb7d7f16a104924c7 Trac #29289: Remove support for installing old-style SPKGs, deprecated in Sage 6.9) does not. Interestingly, it's been sort of hit-and-miss on whether the error shows up when doing just a './sage -b'. I'm not familiar enough with Sage's configuration or packaging to run it down any further, but hopefully this info can help. On Saturday, July 11, 2020 at 5:26:02 PM UTC-7, Paul Masson wrote: > > Just built a ticket based on 9.2.beta3 and the same problem occurs. > > On Saturday, July 11, 2020 at 4:09:56 PM UTC-7, Paul Masson wrote: >> >> After a successful incremental build from 9.2.beta2, trying to start a >> new notebook results in the browser console error "Failed to load resource: >> the server responded with a status of 404 (Not Found)" when trying to fetch >> Mathjax from http://localhost:8888/nbextensions/mathjax/MathJax.js. Has >> anyone other than Dima seen this also? >> >> This appears to be a serious server configuration error. I don't see any >> ticket in either this beta or the previous one that would cause this. Am I >> missing some new configuration step? Sage built and runs just fine. >> > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/9049ca5c-e4ba-40a5-906e-d0b8d2adc691o%40googlegroups.com.
