Error message to acess portal reset refresh page

ERROR

Oops, something has gone wrong — please refresh the page. If refresh doesn’t help, throw this text at us in chat:

Cannot read property ‘indexOf’ of undefined

You may try to Reload Content or navigating to Root Page
.

I have also got a few of these over the past couple of days. In my experience, reloading has fixed it each time.

in week emd reloading did not woked , now it worked