merbst
commented
6 years ago me too! I've had other critical errors on PlanetMath since 2013 which made me think to myself, I would love to contact whomever is necessary for myself to contribute fixes.
I guess today is the day I am now serious about joining the Development effort.
My own error message is nearly identical, and occurs on most pages when I am logged in:
User error: Socket error: Could not connect to "http://planetmath.org:8890/sparql?query=%0APREFIX+msc%3A+%3Chttp%3A%2F%2Fmsc2010.org%2Fresources%2FMSC%2F2010%2F%3E+PREFIX+skos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%23%3E+PREFIX+dct%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%3E+PREFIX+local%3A+%3Chttp%3A%2F%2Flocal.virt%2F%3E+SELECT+%3Flabel+WHERE+%7B+GRAPH+%3Chttp%3A%2F%2Flocalhost%3A8890%2FDAV%2Fhome%2Fpm%2Frdf_sink%23this%3E+%7B+msc%3A11A63+skos%3AprefLabel+%3Flabel+FILTER+langMatches%28+lang%28%3Flabel%29%2C+%22en%22+%29+%7D%7D" (proxy: 0): Connection refused in ARC2_Reader in _sparql_request() (line 92 of /home/jcorneli/beta/sites/all/modules/sparql/sparql.module). User error: missing stream in "getFormat" via ARC2_Reader in _sparql_request() (line 92 of /home/jcorneli/beta/sites/all/modules/sparql/sparql.module). User error: missing stream in "readStream" http://planetmath.org:8890/sparql?query=%0APREFIX+msc%3A+%3Chttp%3A%2F%2Fmsc2010.org%2Fresources%2FMSC%2F2010%2F%3E+PREFIX+skos%3A+%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%23%3E+PREFIX+dct%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F%3E+PREFIX+local%3A+%3Chttp%3A%2F%2Flocal.virt%2F%3E+SELECT+%3Flabel+WHERE+%7B+GRAPH+%3Chttp%3A%2F%2Flocalhost%3A8890%2FDAV%2Fhome%2Fpm%2Frdf_sink%23this%3E+%7B+msc%3A11A63+skos%3AprefLabel+%3Flabel+FILTER+langMatches%28+lang%28%3Flabel%29%2C+%22en%22+%29+%7D%7D via ARC2_Reader in _sparql_request() (line 92 of /home/jcorneli/beta/sites/all/modules/sparql/sparql.module).
I'm shown this when visiting http://planetmath.org/