The transaction was aborted (returned %TRUE in operation-error signal).
App/runtime is already installed
An authentication operation failed, for example, no correct password was supplied. (Since: 1.7.3)
The App/Runtime is already installed, but from a different remote.
The pulled commit is a downgrade, and a downgrade wasn't specifically allowed. (Since: 1.0)
Exporting data failed. (Since: 1.0.3)
Invalid data. (Since: 1.0.3)
Application, runtime or remote name is invalid. (Since: 1.0.3)
A ref could not be parsed. (Since: 1.0.3)
The App/Runtime needs a more recent version of flatpak.
An operation tried to access a ref, or information about it that it was not authorized. For example, when succesfully authenticating with a server but the user doesn't have permissions for a private ref. (Since: 1.7.3)
Cached data was requested, but it was not available. (Since: 1.4.0)
App/runtime is not installed
App/runtime was only pulled into the local repository but not installed.
More disk space needed. (Since: 1.2.0)
An operation was not allowed by the administrative policy. For example, an app is not allowed to be installed due to not complying with the parental controls policy. (Since: 1.5.1)
The specified ref was not found. (Since: 1.4.0)
The specified remote was not found.
Remote can't be uninstalled. (Since: 1.0.3)
A runtime needed for the app was not found.
Runtime can't be uninstalled. (Since: 1.0.3)
Sandbox setup failed. (Since: 1.0.3)
The App/Runtime install was skipped due to earlier errors.
Missing GPG key or signature. (Since: 1.0.3)
An operation is being attempted by the wrong user (such as root operating on a user installation). (Since: 1.2.0)
Error codes for library functions.