Problems with Steam VR-input action manifest

Hello dear Unity community,

I got a problem with the SteamVR-Input in my current Unity file. I have not touched the file since two months, but when i opened it, a lot of errors popped off. They are all of the same type: "Assets\SteamVR_Input\ActionSetClasses\SteamVR_Input_ActionSet_default.cs(79340,49): error CS0102: The type 'SteamVR_Input_ActionSet_default' already contains a definition for 'Haptic'"
When I open the SteamVR-Input-menu under window>SteamVRInput, it shows multiple in- and outputs of the same type. I tried to delete them manually and save the settings, but as soon as I close and re-open the window, they show up again.
I was looking in the Unity-files under "projectname>Assets>SteamVR>Input" and deleted the "ExampleJson"-folder and copy&pasted it back there again.
Since I couldn't find any similar problem as mine, I opened a new thread.

This may be a simple issue for you, but I am not really experienced with Unity and I would be really grateful for any kind of help! <:
PS : Sorry for my bad english, it isn't my main language.