Hello,

I have Backpacks installed on my server, it si working fine.
But now i installed EventManager and every time i load EventManager, the Backpacks stops working.

I get this error:

(17:22:49) | Failed to run a 0.10 timer in 'Backpacks v3.3.0' (InvalidCastException: Null object cannot be converted to a value type.)
  at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in <fb001e01371b4adca20013e0ac763896>:0 
  at System.Convert.ChangeType (System.Object value, System.Type conversionType) [0x0000c] in <fb001e01371b4adca20013e0ac763896>:0 
  at Oxide.Core.Plugins.Plugin.Call[T] (System.String hook, System.Object[] args) [0x00008] in <ec05e0208c9149bba43236ca58fea105>:0 
  at Oxide.Plugins.Backpacks.VerifyCanOpenBackpack (BasePlayer looter, System.UInt64 ownerId) [0x00016] in <f6e74a89273d48038a01103b520ed24c>:0 
  at Oxide.Plugins.Backpacks+Backpack.Open (BasePlayer looter) [0x00101] in <f6e74a89273d48038a01103b520ed24c>:0 
  at Oxide.Plugins.Backpacks+<OpenBackpackConsoleCommand>c__AnonStorey4.<>m__0 () [0x00010] in <f6e74a89273d48038a01103b520ed24c>:0 
  at Oxide.Core.Libraries.Timer+TimerInstance.FireCallback () [0x00018] in <ec05e0208c9149bba43236ca58fea105>:0​

Can anyone give me a hand with it please?

Are you running the new 4.0 beta of Event Manager? It seems that one doesn't have an isPlaying API method which is causing this issue.

There seems to be a bug at the moment where the main download button on the plugin page is giving out the beta version. If you downloaded the beta by mistake, you can download specifically the 3.x version from the updates tab on the Event Manager plugin page.

Thank you!
Yes that was the problem.