SQLite4Unity3d | SQLite made easy for Unity3d | Database library

I am trying to use sql-lite in my Unity3D project. In fact, I used it in the past now I am trying to update it. Unity version and sql-lite version has changed since then.

Now I get an error like this;

error CS1703: Multiple assemblies with equivalent identity have been imported: 'C:\Users[username]\Documents\Unity Games[your program name]\Assets\System.Data.dll' and 'C:\Program Files\Unity\Editor\Data\NetStandard\compat\2.0.0\shims\netfx\System.Data.dll'. Remove one of the duplicate references.

As I understand from the message that, sqlite wants to use its own System.Data.dll file, but it has the same library name in .net. So this causes a conflict and unity throws an error.

I tried to delete the System.Data.dll and its meta filewhich is in Assets file, but did not work. I also tried to change the file name in Asset folder but nothing changed...

Do you have a solution for this problem? I have tried in both Unity 2018 and 2019 versions.

Additional info may help others: In the past I had a problem with sqlite in my games. I had handled the situation like putting or copying my data sqlite file (filename.sqlite as an example) into the folder:

C:\Users[username]\AppData\LocalLow\[app folder]\[app name]\filename.sqlite

Because unity looks for the folder in script and that folder exists in windows which I mentioned above;

string filepath = Application.persistentDataPath + "/" + "filename.sqlite";

This helped me to solve my problem in the past. Now I am stuck with a different problem...

Solution: Here is the solution by the guied of Алексей Кудряшов and blending my sqlite package. Thanks to him for his suggestion.

1- I deleted all all Plugins, GoogleMobileAds, PlayServicesResolver etc.

2- I first installed my admob package back

3- I installed everything manually in the link; SQLite4Unity

4- I installed sqlite package but while installing it, I select none and i installed only "Mono.Data.Sqlite" file. If you have it or if you find it you can manually add it into Asset folder of Unity3D. Also you may find it from; SQLite web page

5- Then Console said me that there is a conflict in x86 and x64 folders for sqlite3.dll file so, I clicked the x86 folder, then clicked sqlite3.dll then in the inspector panel I disabled everything.

6- Then I imported "using SQLite4Unity3d;" for my data script.

7- I also imported "using Mono.Data.Sqlite;"

8- Then everything worked well.