The crossroads shows an error in that Source, Triangle indicates that your source has some warriors
Just open these files to find Red x under the line and marks in the original editor if warnings appear as a triangle with ! in the sidebar of the source code editor
If your source code is large, you can use the ctrl + . shortcut ctrl + . to see errors in the source file. The following shortcuts will go to top-down warnings and errors in your eclipse
A few shortcuts to see errors in the eclipse:
Next error: `Ctrl + .` Previous error: `Ctrl + ,` Quick fixes: `Ctrl + 1`
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