"weka operator does not appear when it has installed weka extension"
please help me, i have installed the latest version of rapidminer, version 8. i also have installed weka extension. but i did not find weka operator. how to bring it up?
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Are you able to successfully install other extensions?
Also, remember that the Weka extension isn't just one operator called "Weka" but rather it is a set of modeling extensions using algorithms from the open-source Weka project. If you look in your extensions folder in your operator list, it actually looks like this:
I've tried everything you suggest, but it still does not show up 
I've got the installation notification succeeded, but weka extension like the picture you sent does not show up
Altair Employeehello @putrilestarig - please send me your rapidminer-studio.log file (in your .RapidMiner folder) via private message and I will take a look.
Scott
already I send, please help 
Hi,
Step 1: Try Restarting the Application, if this does not work try step 2
Step 2: Switch off the Anti Virus on your computer and Try reinstalling the extension again.
Make sure you have the updated JAVA Version.