The page (recent as today, 22:18 CET) contains a Math with the above error.
The editor said he changed the math several times and got different errors,
mostly probably syntax errors. This error message however complaining about
not syntax problems but installation ones, which is very weird.
jeronim_ checked and said:
22:20:34 <@jeronim_> i dunno what that math error is about
22:20:45 <@jeronim_> it's not just yongle, it's other machines
22:21:35 < grin> jeronim_: editor said he changed a word in the math
22:21:49 < grin> jeronim_: and the error come up. maybe page history shows it,
I try to check
22:22:03 <@jeronim_> sorry i can't really help beyond just seeing if the right
software is installed
22:22:11 <@jeronim_> you'd have to ask someone else