Error about duplicates

[daelfer]

I get the below error. Does this mean that it has already been implemented into UNITY 2019.x ?
I cant find any documentation.

Microsoft (R) Visual C# Compiler version 2.9.1.65535 (9d34608e)
Copyright (C) Microsoft Corporation. All rights reserved.

error CS1703: Multiple assemblies with equivalent identity have been imported: 'C:\MySQL\Link To MySQL\Assets\Plugins\System.Drawing.dll' and 'C:\Program Files\Unity\Hub\Editor\2019.3.13f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Drawing.dll'. Remove one of the duplicate references.
error CS1703: Multiple assemblies with equivalent identity have been imported: 'C:\MySQL\Link To MySQL\Assets\Plugins\System.Data.dll' and 'C:\Program Files\Unity\Hub\Editor\2019.3.13f1\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Data.dll'. Remove one of the duplicate references.

[daelfer]

Well removing them seemed to work and now i have a connection. However when i do something simple like "SELECT COUNT(id) FROM Table" it works find but when i do "SELECT username FROM Table" I get a connection timeout and when i use "SELECT * FROM Table" i get
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) [0x0001e] in