The compiled versions of all your modules are stale. One way to fix this is 
to run <> `raco setup`. On my 
system I have to run it as root, but you may be able to run it as the user 
that installed Racket.

On Friday, September 28, 2018 at 5:49:21 PM UTC-7, James wrote:
> I just tried upgrading to Racket 7 on one of my machines (macOS 10.11.6) 
> and I get the error shown below in DrRacket.  I thought I should mention it 
> since I am probably not the only one.  I installed with the obvious method, 
> which is to just drag the new Racket folder over to applications as it 
> indicates in the disk image.  Did I miss some standard set of instructions 
> for upgrading?  This happens any time I try to run something from DrRacket. 
> read (compiled): wrong version for compiled code 
>   compiled version: 6.10 
>   expected version: 7.0 
>   in: rkt/compiled/main_rkt.zo 
> James

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