Unity development memo 000025: error cs0433: the type ‘task’ exists in both ‘xxx’ and ‘YYY’

After Bolt 1.4.0F3 was added to Unity2019 version, the following error appeared:
The Library \ PackageCache \ [email protected] \ Scripts \ Editor \ TMP_PackageUtilities cs (310) : error CS0433: The type ‘Task’ exists in both ‘system.threading, Version=1.0.2856.102, Culture=neutral, PublicKeyToken= 31Bf3856AD364e35’ and ‘mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’
After careful study, I guess this is a third-party plug-in compatibility problem with the Unity version.
The Unity update was so fast that some third-party plug-ins couldn’t keep up.
Fortunately, Bolt 1.4.4 was downloaded and re-imported Unity2019, and the problem was solved.
It seems that in both learning and development, it is better for the average coder not to use the latest version of Unity. It does bring you new features, but it also brings you new bugs!
 
Old head class: https://edu.csdn.net/lecturer/3617
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