ElementContainers is a new feature from quite some time ago (v3.0), meanwhile we have v3.5. Please make sure, the library path does not point to older source code or files, clean your pc of old files before installing a new version.
ElementContainers is a new feature from quite some time ago (v3.0), meanwhile we have v3.5. Please make sure, the library path does not point to older source code or files, clean your pc of old files before installing a new version.