Scene already exist. How to solve?
You can back up the scene by long pressing scene name / export xml to sd
Then delete the scene.
1) One fix is rename the open dup item. This also renames references to the item in any loaded code. When the problem prj loads, it will reference its own copy, not the renamed one.
2) When using anything in a different project, clone it, move to the new project.
3) Another way is by using vars. Set %TRef to "MyTask" and only use the var to call the task. This way Tasker wont try to save/load copies of it in every project that uses it.
4) Edit xml. Tricky and could cause issues if done wrong. But if you have a look at them, you may understand Tasker better. Or get a headache.