Converted my Unity 2017.4.34f1 game to 2019.2.13f1, bug in Unity files??

I converted a game that ive worked on for a while now from 2017.4.34f1 to 2019.2.13f1 and for some reason i have 146 errors and over 1000 warnings.
Might have been some errors in Unitys files
Does anyone know whats happened?

 

There are many things that worked in 2017 that have been removed or work differently in 2019

Legacy particle systems and JavaScript has been removed . There is an updater somewhere for particles but you have to do it before you upgrade.

If you used the early version of text mesh pro you have use a special updater because the 2019 textmesh Pro is not compatible

Prefabs work differently

I see text mesh pro errors here so I am guessing you had an earlier version of text mesh pro in your unity 2017 project but I’m not an expert

Errors can be overwhelming and frightening but in many cases you can solve them a bunch at a time with patience even if it seems intimidating

I’ll leave it to a unity expert to decipher these error messages correctly

 

Deleted TMP plugin and installed newest version. Works now. Thanks