Why are the texts red on monodevelop?

It is inconvenient to work.
But it works fine on Unity3D Editor.
Unity3D Editor do not recognize the error these red texts.

68929-redcodemonodev.png

Your DLLTest library is not recognized. You must compile it again or not use it.

Go to Build > Clean All
Worked for me!

They’re not errors. It’s just colouring the words it recognises as classes or functions to try to make it more readable.