Eclipse - An internal error occurred during: “Compute launch button tooltip”

Question

I launched Eclipse earlier to jot down a snippet and was faced with the following as an error when I tried to run a fresh project:

An internal error occur

Answer 1

I also encountered this issue, the reason why this issue occurred on my project was due to I was missing the JRE System Library in the root folder of my project. To solve this issue, make sure you have the libraries like JRE System Libraries on the root folder of your project.