F#'s fshtmldoc.exe using Mono/OS X

Question

This is doubtless something obvious, but downloading the F# PowerPack from codeplex and running fshtmldoc produces this error:

clements$ mono ./fshtmldoc.exe FSharp.PowerPack.dll
Processing 'FSharp.PowerPack.dll'...
Unexpected failure while writing HTML docs: An exception was thrown by the type initializer for Microsoft.FSharp.Metadata.AssemblyLoader

This is using mono 2.6.3, F# 2.0 1.9.9.9, & OS X 10.6.3 on a 32-bit intel processor. Any help would be appreciated.

Many thanks,

John Clements

(repost from powerpack online discussion group--no response there)