its still countin RP but its showing 0 RP and the shop dont open with /S

[SERVER v1.0.20] Started as service
[SERVER v1.0.20] Running as service
[SERVER v1.0.20] Got Message: Ready
[SERVER v1.0.20] Got Message: Compile
[SERVER v1.0.20] Console: ServerRewards.cs(408,24): warning CS0219: The variable `categories' is assigned but its value is never used
ServerRewards.cs(42,29): warning CS0649: Field `Oxide.Plugins.ServerRewards.uiFadeIn' is never assigned to, and will always have its default value `false'
ServerRewards.cs(27,33): warning CS0169: The private field `Oxide.Plugins.ServerRewards.EventManager' is never used
ServerRewards.cs(27,47): warning CS0169: The private field `Oxide.Plugins.ServerRewards.HumanNPC' is never used
ServerRewards.cs(27,67): warning CS0169: The private field `Oxide.Plugins.ServerRewards.PlaytimeTracker' is never used

[SERVER v1.0.20] Got Message: Exit
[SERVER v1.0.20] Exit received.
[SERVER v1.0.20] Connection closed.
[SERVER v1.0.20] Shutdown

thats the only error i found after reloading the plugin

All of the above messages are warnings, not errors, and will not affect the plugin working or not. The log file you want to look at is the main oxide_* prefix log, not the compiler log.

i found it now was something with oxide 

What exactly was the issue with it?

In the /RustDedicated_Data/Managed folder you will have both Facepunch.Steamworks.Win64.dll and Facepunch.Steamworks.Posix64.dll (or something like that). Delete the one that isn't for your servers OS