cyanogenmod 12.1 nightly on my Oneplus One

[Jason Heneghan]

Hi,
I updated to Cyanogenmod 12.1 nightly on my Oneplus One using TWARP recovery. It installed fine , but the GAPPS (latest version ) I installed did not and will not install.
On-top of that i have tried flashing many other roms and even numerous factory resets but nothing will load and nothing will remove the troublesome version of Cyanogenmod 12.1 that i just installed.

Any advice, please

Thanks