Make sure your on the latest version of the addon, ALWAYS check for updates and always follow these simple tips:
"Sports Mania / SNHD error Check the log for more information"
So if you get this error message please do the following.
On the same connection as your addon (so wifi if your box is connected to the router) go to the site your signed up to:
If the site works (you can connect to the site) but your addon throws up an error simply highlight the addon and hold the "OK" button and addon settings and click "Reset All Settings" as what that does is it wipes the cookie and also user details from the addon and basically lets you start again, Then restart your device and router if your using a build don't worry it will NOT wipe your build, anyway then from there boot up kodi and go back to our addon and input your details.
If you STILL cant get in make sure your sub hasnt run out by going to (depending on what site your signed up to) http://sportsmania.rocks/payments/member/payment-history
and check your sub there.