Unity Fatal error! When Importing Asset from the Asset store.

Hello,

I’m having a error in Unity 5.2.2f1 on Mac running 10.11.1. When I try to import something from the asset store I get the error

“Fatal error! attempt to write a readonly database UnityEditor.Web.JSProxyMgr:DOTask()”

I do have the project on a external hard drive tho (I have in the past always done this with out having a error tho) and the place where the project is, is not set to read only.

Does anyone know how to fix this issue?

Thank you for your time and I hope you all have a great day.

I made a project on the internal hard drive and it worked fine, so its a issue with the external hard drive.

Does anyone know how to fix this?