Hi hm571989,
Kindly provide your firmware version:
Settings > System > About Phone > Software information
Please tell me your MX player version.
About how long after using the app does this error show?
Does it appear every time or occasionally?
Could you show us the screenshot or short video of the error?
To share videos, please upload it to ASUS WebStorage (https://www.asuswebstorage.com/navigate/) and share the link with us.
Thank you 🙂