I can't uprade from tourer to tourer +

I can’t uprade from tourer to tourer +
what’s wrong ?
thank you

Something went wrong when trying to update your subscription, please let us know if this happens again. - Code:functions/unknown

(Debug information, this helps us helping you, you can remove this if you don’t want to share this data, it should not contain any personal or sensitive information)
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36
Cookies Enabled: true
Screen: 1923 x 921 px - 1dppx

This usually happens if there is an issue with your payment method. Typically you received a new credit card or there is an issue at Paypal. You can update your payment details again in the manage Tourer view here: