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I had this problem and solved it by moving RPC call from Awake method to Start. Probably on Awake method call the object is not fully constructed...
Probably you forgot to made it thru PhotonNetwork Object projecPrefab = PhotonNetwork.Instantiate(projectilePrefab, projectileLocation,...
I solved the problem by removing the files which unsuccessfully tried to upload the first time. By default, they are located in the folder...