R cannot be resolved to a variable

Question

I would like to fix this error

R cannot be resolved to a variable

I looked up many answers, but I could not get the right one;

Answer 1

what did it for me...

when i checked my project properties file (/project_root/project.properties), it had a reference to an old android version target which i no longer had installed

# Project target.
target=android-15

as soon as I changed this to say 17, it worked perfectly, soon as the file was saved my gen folders were built and inflated.

# Project target.
target=android-17