red mark in src file

[harryjohnlabs]

There is a red mark is showing in source file so already installed example cannot run is shows error.

[Michael19842020]

when you are installing and connecting the fog with the java jars on the first place they are not connected properly.
Try to connect the eclips with Ifogsim properly at the beginning because all those X signs should not be there after connecting with the cloudslab.

[SeharGhuman]

I have same issue, is it resolved?