One of the parameters of pydream.core.run_dream is called "likelihood" and the documentation specify it to be "A user-defined likelihood function".
It seems though that the code is actually expecting a log-likelihood function, as seen in pydream.model.total_logp line 30:
loglike = self.likelihood(q0)
This can be easily solved by changing the parameter name to be log_likelihood and changing the documentation accordingly.