Unity Fatal Error: dataOffset !=file.GetPosition()

I was importing a package from Unity store and got this error:

Fatal Error: dataOffset !=file.GetPosition()

There are probably many reasons why this error can appear but the first thing you should do is check if there is insufficient space on your computer’s hard disk (the one where you keep your projects and also

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Unity 2019 error: Feature `out variable declaration’ cannot be used because it is not part of the C# 4.0 language specification

After upgrading Unity editor from 2017 to 2019 you might get some of these errors when you update your old project and hit play:

…/Library/PackageCache/com.unity.textmeshpro@2.0.1/Scripts/Runtime/TMPro_UGUI_Private.cs(1865,73): error CS1644: Feature `out variable declaration’ cannot be used because it is not part of the C# 4.0 language specification

…/Library/PackageCache/com.unity.textmeshpro@2.0.1/Scripts/Runtime/TMPro_Private.cs(1916,130): error CS1644: Feature `out variable declaration’ cannot be used

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