def __init__(self, description, error):
        super(ErrorHolder, self).__init__(description)
        self.error = util.excInfoOrFailureToExcInfo(error)
Add an asset. Can be JavaScript, CSS, images, etc. 
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/trial/runner.py/ErrorHolder.__init__--crossover with--dataset/ETHPy150Open zoofIO/flexx/flexx/app/assetstore.py/AssetStore.add_asset