python - Cannot create new ipython notebook or start jupyter -

whenever try start jupyter ipython notebook. following error

sometimes, after restarting system able start ipython notebook, cannot create notebook , gives me error saying forbidden.

my command prompt says 0 active kernels

else have issue or know answer problem

i used have issue too. seems bug because restarted pc , work again. it's been weeks don't have issue anymore , didn't intentionally solve it.