based on the hresult value…it is more a change in xaml or json would have triggered this error…can be random as well due to parsing issue or so…
to validate just take a back up of project.json and try to remove and reopen so that it gets created…if that is not the case then may be due to major changes in activities the xaml files might have some extra characters which might be effecting…
cheers
Anil_G
sonaliaggarwal47
ashokkarale
sharazkm32
Jon_Smith
Bal_Son
Nitesh
Marielle_Timajo_Apay_NCS
adi.mehare
Youri98