Hey pgadmin i'm having issues reinstalling pgadmin4

I'm having major issues trying to run my pgadmin application, i had it up and running a couple of days ago but i was advised to close the application due to a bug being on my display although now pgadmin won't load and keeps disappearing and crashing saying error then after a couple of times it came up with server could not be contacted do you have any solutions and i have MACos 

thank you

Ali