"package installer keeps stopping"

I have a rooted (Magisk) Fairphone 5 running the Fairphone ROM. I installed F-Droid using adb. I cannot update F-Droid itself from with in F-Droid. From F-Droid I have tried to install OI File Manager, LinPhone, and Easter Eggs. They do not install and the only feedback I get is "package installer keeps stopping". I also downloaded the [OI File Manager apk from the github site](https://github.com/openintents/filemanager/releases) directly to my phone and tried to install it from AOSP file manager with the same results. I am allowing installing APKs from unknown sources in settings. I *am* able to install apks using

. I ran

logcat

when trying to install OI File Manager and found two possible errors:

NotificationService: Cannot find enqueued record for key: 0|org.fdroid.fdroid|1|https://f-droid.org/repo/org.openintents.filemanager_40.apk|10195 

PackageParser: Unknown element under : meta-data at /data/user/0/org.fdroid.fdroid/cache/apks/f-droid.org--1/org.openintents.filemanager_40.apk Binary XML file line #63

I have also installed [SAI](https://f-droid.org/en/packages/com.aefyr.sai.fdroid/) which gives more detailed error messages and it says "Can't install packages while in secure FRP" But since it is happening with different APKs, I am not sure how to proceed to fix this.