ERROR: Message '+' not understood.
RECEIVER:
   nil
ARGS:
   Integer 1
PATH: .../numbers.scd <edited>
CALL STACK:
    DoesNotUnderstandError:reportError   0x114aee978
        arg this = <instance of DoesNotUnderstandError>
    Nil:handleError   0x115030b28
        arg this = nil
        arg error = <instance of DoesNotUnderstandError>
    Thread:handleError   0x114dcf2a8
        arg this = <instance of Thread>
        arg error = <instance of DoesNotUnderstandError>
    Object:throw   0x165c4cc58
        arg this = <instance of DoesNotUnderstandError>
    Object:doesNotUnderstand   0x114e6dc58
        arg this = nil
        arg selector = '+'
        arg args = [*1]
    < closed FunctionDef >  (no arguments or variables)
    Interpreter:interpretPrintCmdLine   0x1154b9e38
        arg this = <instance of Interpreter>
        var res = nil
        var func = <instance of Function>
        var code = "p + 1"
        var doc = nil
        var ideClass = <instance of Meta_ScIDE>
    Process:interpretPrintCmdLine   0x1145986c8
        arg this = <instance of Main>
^^ The preceding error dump is for ERROR: Message '+' not understood.
RECEIVER: nil