Why am I getting an error while trying to install rasa in python 3.6

Question

ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts. tensorflow 1.13.2 requires tensorboard<1.14.0,>=1.13.0, but you have tensorboard 2.4.1 which is incompatible. tensorflow 1.13.2 requires tensorflow-estimator<1.14.0rc0,>=1.13.0, but you have tensorflow-estimator 2.4.0 which is incompatible.