Firstly you should try to restart the app. If that doesn't works, you need to restart the device by turning it off and back on. This also works for TVs, Blu-Ray players and phones.
If this also doesn’t fix the Netflix app crashing you will need to dive deeper into the problem. If you are on a phone, tablet or a streaming box like the Apple TV, you should try to uninstall the app, restart your device and then re-install Netflix.

Netflix activate | [b]Netflix tv help | [b]Help Netflix[/b][/b]

Step 1: Login in to your TV provider's website

Step 2: Supported browser with Flash?
Make sure you're using a supported browser. List of supported browsers
Check to make sure you have the latest version of Adobe Flash Player installed. To do this, go to Adobe Flash .

Step 3: Browser troubleshooting
Clear your browser's cookies. To find out how to do this, search your browser's help for 'cookies.'
Reopen your browser.

If you still can't sign in, try the following browser troubleshooting steps: 
Clear your browser's cache. To find out how to do this, search your browser's help for 'clear cache.'
Use another browser (e.g. Internet Explorer or Google Chrome). 

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