I'm having similar problems. It appears to be due to various
issues with dependent packages and whatever SqueakMap is doing
to resolve them.  I was able to get KomHttpServer and SeaSide
loaded into a Squeak 5707 image as follows:

  Load Refactory Browser
  Load KomHttpServer
    Answer No to KomPackageBuilder (ignore warning about version)
    Answer No to SBKomServices with StarBrowser
    Answer No to SBKomHttpServer with StarBrowser
    Answer Yes to SeaSide

Some apparent problems (or symptoms) are:
- KomHttpServer depends on Refactory Browser but does not declare
  the dependency
- DynamicBindings->KomPackageBuilder->SARBuilder load fails (or
  gives a bogus warning?).
- StarBrowser load fails.

I also get error dialogs such as the following that seem to indicate
something screwy in the version management logic (I'm not sure where
this lives, but here is an example error dialog):

    +=============================================+
    |  Warning: prerequisite specified version 8  |
    |  of SARBuilder but version 8 is currently   |
    | registered on SqueakMap. Incompatibilities  |
    |       might exist and cause problems.       |
    +---------------------------------------------+
    |                      OK                     |
    +=============================================+



Dave

On Sun, Feb 29, 2004 at 05:33:04PM +0100, bernhard at pieber.com wrote:
> I wanted to try out Seaside but I got a debugger when I tried to load
> KomHttpServer from SqueakMap.
> 
> I did the following:
> - Downloaded Squeak3.7a-5657.zip
> - Updated code from the Squeak Public Updates (European Mirror)
> - Opened the Package Loader
> - Upgraded all installed packages
> - In the process I was asked if I wanted to install the latest version
> of Monticello
> - Answered yes
> - Installed KomHttpServer 6.2 from SqueakMap
> - I was asked whether I also wanted to install KomPackaging.
> - I answered no because previous posts to the list suggested this. (See
> the thread 'Issue with KomHttpServer')
> 
> I got the following message dialog:
> Error occurred during install:
> KomPackagingInfo class>>default
> 
> I pressed Alt-. and looked at the full stack. The error originates from
> the following statement in SARInstaller>DoIt
> 	KomPackagingInfo default buildNumber: '36' asVersion
> 
> Has anyone managed to get Seaside and KomHttpServer running in a
> 3.7alpha image?
> 
> - Bernhard
>