[Newbies] SqueakMap error

[itsme213]

I just tried to open SqueakMap package loader and got this option:

  "The map on disk is more than 10 days old. Update it from the internet?"

I chose "Yes", and got an error:

  "Reading an instance of ByteSymbol - which modern class should it 
translate to?"

Any suggestions or workarounds?

Thanks.