error when trying to enable attachments on a feature service

[StuartMoore]

i'm trying to enable attachments on an AGOL Feature Service, when i toggle the button in the 

i get this unhelpful error:

so i tried to do it in the admin section by updating the json but that returns this error:

has anyone else seen this and fixed it? how can i delete the table ?

Stu

[Laura]

Sometimes I can an error but it actually went through. Refresh it all and see if it's enabled from the layer settings.

[StuartMoore]

thanks @Laura i checked but its still showing as disabled and i'm still getting the error when trying to enable it