There's a null in the data even if you delete it

(20:05:50) | Failed to call hook 'OnPlayerRespawn' on plugin 'NoSleepers v0.5.3' (NullReferenceException: Object reference not set to an instance of an object)
at Oxide.Plugins.NoSleepers.OnPlayerRespawn (BasePlayer player) [0x00000] in <58aeba84e8024205910a00d6ed7a6931>:0
at Oxide.Plugins.NoSleepers.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0030c] in <58aeba84e8024205910a00d6ed7a6931>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9affce1cd15c4ec183941adef8db1722>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <4452f821def6406d834e4149849fe7ea>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <4452f821def6406d834e4149849fe7ea>:0

You clearly did something wrong, first unload the plugin then delete the file then reload it. I will add something to prevent a null exception in the datafile in the coming update but until then you can do as I said and will not encounter any issues.

Oh, I haven't read the Unloading First part, and then deleting. My Apoligies.

Also, why have I been unfriended on Discord, Collect?