Without more information as to precisely what you might (or might not) have tried, contributors here are left guessing as to how far you have progressed with troubleshooting the problem. To avoid repetition of advice, please provide more details.
Similarly, if you can provide a screenshot of the error that you see (suitably redacted if necessary, using markup tools, to remove any personal or sensitive information), this will assist contributors in understanding the nature of your problem.
Take a screenshot on your iPad - Apple Support
Use Markup on your iPhone, iPad, or iPod touch - Apple Support