New posts in Compilation Error

cloze multichoice question in the latex using the package 'moodle'

Error: ! Font OT1/mathkerncmss/m/sl/10.95=mathkerncmssi10 at 10.95pt not loadable: Met ric (TFM) file not found

Setting \familydefault as \sfdefault is causing the arrow character → to throw Package textcomp Error: Symbol \textrightarrow not provided

Why won't this compile? Argument of \h has an extra {

PSTricks: Newly introduced error in package

Vimtex: how to display error messages?