Use correct variable in error message

Author: Flamefire

easybuild/framework/easyblock.py

@@ -2963,7 +2963,8 @@ def prepare_step(self, start_dir=True, load_tc_deps_modules=True):
             if os.path.isabs(self.rpath_wrappers_dir):
                 _log.info(f"Using {self.rpath_wrappers_dir} to store/use RPATH wrappers")
             else:
-                raise EasyBuildError(f"Path used for rpath_wrappers_dir is not an absolute path: {path}")
+                raise EasyBuildError("Path used for rpath_wrappers_dir is not an absolute path: %s",
+                                     self.rpath_wrappers_dir)
 
         if self.iter_idx > 0:
             # reset toolchain for iterative runs before preparing it again