Suddenly getting errors after running playmode : Unable to use a named GUIStyle without a current skin?

Hello, I'm fairly new to Unity and just have a simple project going, everything has been working just fine, all the sudden this is happening after hitting Play.

I'm not sure how to debug because I'm not great with programming, and clicking the error leads me nowhere,, I am only using 2 external packs the rest is very basic 2D top down movement with some enemies , all has been working without any code errors..

"A* Pathfinding" and also "TextMeshPro"

TMP being the most recent addition,

Only thing stopping me from my first idea release, any help towards the right direction would be greatly appreciated

Thanks for reading,