[racket-users] racket documentation does not open

Hi, I have installed Racket 6.9 on macOs 10.12.5. If I try to open any documentation page I get this error message: browser-run: process execute failed: '(# "-e" "open location \"file:///Applications/Entwicklung/Racket%20v6.9/doc/index.html\“") What can I do? Johannes -- You received this me

[racket] x-expressions

Hi! In DrRacket version 5.02 this x-expression (validate-xexpr '(add x 2)) is legal. In version 5.2 I get the error message Expected a string, symbol, number, comment, processing instruction, or list, given 2 Can anyone explain this to me? Johannes Staatl