Execution warning: Class 'Document' not found
ERROR: Message 'isMetaClass' not understood.
RECEIVER:
   nil
ARGS:
CALL STACK:
    DoesNotUnderstandError:reportError   0x193a328
        arg this = <instance of DoesNotUnderstandError>
    Nil:handleError   0x193a278
        arg this = nil
        arg error = <instance of DoesNotUnderstandError>
    Thread:handleError   0x193a1c8
        arg this = <instance of Thread>
        arg error = <instance of DoesNotUnderstandError>
    Object:throw   0x193a118
        arg this = <instance of DoesNotUnderstandError>
    Object:doesNotUnderstand   0x1939bf8
        arg this = nil
        arg selector = 'isMetaClass'
        arg args = [*0]
    Meta_Class:initClassTree   0x1939a98
        arg this = <instance of Meta_Class>
        arg aClass = nil
        var implementsInitClass = nil
    Meta_Instr:initClass   0x19399e8
        arg this = <instance of Meta_Instr>
    Meta_Class:initClassTree   0x1939438
        arg this = <instance of Meta_Class>
        arg aClass = <instance of Meta_Instr>
        var implementsInitClass = nil
    ArrayedCollection:do   0x19ae378
        arg this = [*695]
        arg function = <instance of Function>
        var i = 179
    Meta_Class:initClassTree   0x19ad578
        arg this = <instance of Meta_Class>
        arg aClass = <instance of Meta_Object>
        var implementsInitClass = nil
    Process:startup   0x19ac5f8
        arg this = <instance of Main>
        var time = 1390585893.4959
    Main:startup   0x19aaf08
        arg this = <instance of Main>
        var didWarnOverwrite = false
^^ The preceding error dump is for ERROR: Message 'isMetaClass' not understood.
RECEIVER: nil