Hello Friend, I know there are many user which facing problem on installing beetube when they already have installed detube. 

Now Here is solution , 

If you have already install deTube then before to Install beetube you must need to deactivate all plugin's And Delete that all plugin's which you was install for deTube. 

After to Delete all plugin then Install BeeTube and there will be no problem. 
Thanks for your Time. Enjoy BeeTube.