Failed to call hook 'OnServerSave' on plugin 'Economics v3.9.1' (IOException: Sharing violation on path C:\rustserver_fudge_pve_2x\oxide\data\Economics.json)
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x0019e] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options, System.String msgPath, System.Boolean bFromProxy, System.Boolean useLongPath, System.Boolean checkHost) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions,string,bool,bool,bool)
at System.IO.StreamWriter.CreateFile (System.String path, System.Boolean append, System.Boolean checkHost) [0x0001c] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.IO.StreamWriter..ctor (System.String path, System.Boolean append, System.Text.Encoding encoding, System.Int32 bufferSize, System.Boolean checkHost) [0x00055] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.IO.StreamWriter..ctor (System.String path, System.Boolean append, System.Text.Encoding encoding, System.Int32 bufferSize) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.IO.StreamWriter..ctor (System.String path, System.Boolean append, System.Text.Encoding encoding) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at (wrapper remoting-invoke-with-check) System.IO.StreamWriter..ctor(string,bool,System.Text.Encoding)
at System.IO.File.WriteAllText (System.String path, System.String contents, System.Text.Encoding encoding) [0x00000] in <eae584ce26bc40229c1b1aa476bfa589>:0
at System.IO.File.WriteAllText (System.String path, System.String contents) [0x00007] in <eae584ce26bc40229c1b1aa476bfa589>:0
at Oxide.Core.Configuration.DynamicConfigFile.WriteObject[T] (T config, System.Boolean sync, System.String filename) [0x0003f] in <50629aa0e75d4126b345d8d9d64da28d>:0
at Oxide.Core.DataFileSystem.WriteObject[T] (System.String name, T Object, System.Boolean sync) [0x00007] in <50629aa0e75d4126b345d8d9d64da28d>:0
at Oxide.Plugins.Economics.SaveData () [0x0002c] in <906015bf772b4cc49a0fe84e74ce4f8b>:0
at Oxide.Plugins.Economics.OnServerSave () [0x00000] in <906015bf772b4cc49a0fe84e74ce4f8b>:0
at Oxide.Plugins.Economics.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x002c3] in <906015bf772b4cc49a0fe84e74ce4f8b>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <e23ba2c0f246426296d81c842cbda3af>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <50629aa0e75d4126b345d8d9d64da28d>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <50629aa0e75d4126b345d8d9d64da28d>:0

The error means something else is using the file and the plugin was unable to save.