About loading Seaside into Squeak6.0a-17082 ....

Hello

Loading Seaside into Squeak6.0a-17082 .... gives the following error

Character(Object)>>doesNotUnderstand: #greaseInteger

Details [1]

Is there a particular Squeak6.0a version where Seaside loads fine?
http://files.squeak.org/6.0alpha/

Any suggestions how a fix to Grease should look like?

Regards
--Hannes

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Character(Object)>>doesNotUnderstand: #greaseInteger
        Receiver: Character null
        Arguments and temporary variables:
                aMessage:       greaseInteger
                exception:      MessageNotUnderstood: Character>>greaseInteger
                resumeValue:    nil
        Receiver's instance variables:
Character null

WAUrlEncoder class>>encode:on:
        Receiver: WAUrlEncoder
        Arguments and temporary variables:
                aCharacter:     Character null
                aStream:        a WriteStream
                printer:        a GRNumberPrinter
        Receiver's instance variables:
                superclass:     WATableBasedEncoder
                methodDict:     a MethodDictionary()
                format:         65538
                instanceVariables:      nil
                organization:   ('as yet unclassified')

                subclasses:     nil
                name:   #WAUrlEncoder
                classPool:      nil
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'Seaside-Core-Document'
                table:  #(nil nil nil nil nil nil nil nil nil nil nil
nil nil nil
nil nil nil ni...etc...

WAUrlEncoder class>>initializeTable
        Receiver: WAUrlEncoder
        Arguments and temporary variables:
                stream:         a WriteStream
                characterLimit:         255
                index:  0
                character:      Character null
                value:  nil
        Receiver's instance variables:
                superclass:     WATableBasedEncoder
                methodDict:     a MethodDictionary()
                format:         65538
                instanceVariables:      nil
                organization:   ('as yet unclassified')

                subclasses:     nil
                name:   #WAUrlEncoder
                classPool:      nil
                sharedPools:    nil
                environment:    Smalltalk
                category:       #'Seaside-Core-Document'
                table:  #(nil nil nil nil nil nil nil nil nil nil nil
nil nil nil
nil nil nil ni...etc...