The error message means that the OSGi framework is couldnot able to find a version >= 2.12 and < 3 of the org.apache.sling.api.resource Java package for a bundle that wants to import it.
As a result, bundle cannot be activated, so that this bundle cannot work.
this org.apache.sling.api.resource package will be provided by the org.apache.sling.api bundle, so either you have an old version of that bundle in your system, or you have installed incompatible bundles that require a newer version of that package.