Hi,
I know I’m too late for this reply but this method worked for me. So, I’m just putting it out there so that other people too can refer to it. 
Change Permissions
Normally this error will be related to an actual permissions problem, so let’s at least get that out of the way before trying other options.
Go ahead and right-click on the folder and choose Properties.
Next you want to click on the Security tab and then click on the Advanced button.
Now you want to click on the Change Permissions button at the bottom left.
Now is the fun part. It definitely looks complicated and that’s why you have to do this section right, otherwise you’ll think you
set the permissions right when, in fact, they are wrong.
First of all, go ahead and check the Replace all child object permissions with inheritable permissions from this object box.
Then go ahead and uncheck the Include inheritable permissions from this object’s parent box. When you uncheck the box, you’ll get a warning box where you’ll have to choose from Add or Remove. Go ahead and click on Add.
Now a normal folder that is deletable should look something like above with SYSTEM, Administrators and the user (Aseem) having Full Control with the Type set to Allow. At this point, you need to see what’s different and get your permissions to look like this using the Add, Edit and Remove buttons.
If you see any permissions with Deny in the Type, go ahead and remove them. Next make sure to add your username and the Administrators group and give them Full Control. Just click Add and type in the user name for your Windows account and then click Check Names. My Windows user name was Aseem, so I typed that in and clicked the button and it automatically changed it to WINDOWSMAC\Aseem.
Do the same thing for administrators, just type the word and click Check Names. If SYSTEM is not present, go ahead and add that also just to be on the safe side. When you are done and the permissions look correct, go ahead and click OK. It might take some time if the folder is large and has a lot of subfolders. Once it’s complete, go ahead and try to delete the folder!
This answer from Microsoft might be helpful too. You can always look at alternative ways to fix it if this one doesn’t work for you.
