What can I do about this MariaDB 10.0 error?
You may have moved around manually the tablespaces or improperly importing the tables physically. The error assertion is a detection by MySQL InnoDB that pages have internal values that do not correspond to their physical location, thus forcing the kill of the server to avoid further corruption.

I have very very rarely seen that as a problem due to InnoDB programming (at least on upstream and stable MySQL), and more usually due to a problem in datafile or configuration management by an operator. While it should be possible to go back to a consistent state, without knowing more about what kind of processes you have performed, I would start by recommending performing a bull backup of your system so no data is lost.