Account Service registration callback error

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I get this error when importing photon network from the asset store. I have successfully imported PUN on a new project but when i try to load it on an existing project i get this error. Im using unity 5.5.1f1


Assets/Photon Unity Networking/Editor/PhotonNetwork/AccountService.cs(121,22): error CS0122: `AccountService.registrationCallback' is inaccessible due to its protection level

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