You're working in a project that came with Plant 2012 training manual, but you are using plant 2013. Maybe the project didn(t convert ? Did you try in a complete new project ?
Yes i did. You can see the caps at my post no:7
I did it for 2012 training project and in 2013 for new project. When i open the project which comes after the installation plant3d's project name "SampleProject" , i am sure you know that one(please find in the attachment) i cannot add ANY equipment too. So bad
I solved the problem by myself. you should change your display language to English if you are from Turkey or any other countries who have this problem guys. It happens because of the computer's language settings.