Class ArgumentsInTheWrongPlace

source code

              object --+        
                       |        
exceptions.BaseException --+    
                           |    
        exceptions.Exception --+
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                              ArgumentsInTheWrongPlace

When calling BuildFactory.addStep(stepinstance), addStep() only takes one argument. You passed extra arguments to addStep(), which you probably intended to pass to your BuildStep constructor instead. For example, you should do:

f.addStep(ShellCommand(command=['echo','stuff'], haltOnFailure=True))

instead of:

f.addStep(ShellCommand(command=['echo','stuff']), haltOnFailure=True)