====== Error during installation of Locus Map from Google Play ======

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===== Problem =====

I would like to install Locus Map 4 or Pro from Google Play, but it either cannot be installed at all or the installation is not successfully finished.

===== Reasons =====

There may be several reasons for this. In the first place, it is important what you see on the app page at Google Play Store before the installation. If **Device is not compatible** or **Install**: 

==== Device is not compatible ====

Locus Map is compatible with almost all devices running the Android operation system 5 and newer. If you can not install it due to incompatibility, please contact us via email [[mailto:locus.map@asamm.com|locus.map@asamm.com]] and inform us about the type of your device.


==== Install ====

If you tap (click) on the **Install** button, yet the installation does not start, Google Play will probably notify you about the error number. In this case, it is a temporary error on Google Play and the following procedure may help:
 
    * Delete the temporary memory of the Google Play application (your device menu > Settings > Applications > Google Play Store > Clear data)
    * Uninstall the older version of Locus
    * Restart the device
    * Install the application from Google Play again

It may happen that after tapping **Install**, the installation begins but in a short while it stops with the error number again. This is probably an error on Google Play's side. In this case, follow the same procedure mentioned above.

===== List of common error codes =====

==== Error - 24 ====

**Solution**
  * With help of your phone file manager, find /Android/data directory
  * Find package name of Locus application
      * **Locus Map 4** menion.android.locus 
      * **Locus Map Classic** menion.android.locus.pro
  * Delete package name file
  * Try to install Locus application again
==== Error - 25 ====
This error occurs usually on some **Xiaomi devices**, e.g. Redmi 1S. Sometimes the installation does not execute without any reason or error message, sometimes the built-in Xiaomi antivirus app flags Locus as infected and the installation is aborted. :!: **Of course Locus Map contains no viruses** :!:

**Solution**

**Xiaomi** suggests the following procedure (works only in 90% cases):

  - deactivate the antivirus app (Optimization center > Antivirus > settings > uncheck installation monitoring)
  - go to Applications > Security Guard and wipe all app data
  - install Locus Map
  - activate the antivirus app. <wrap alert>Beware! After the automatic update, the Security Guard uninstalls Locus Map without warning.</wrap>

Another method:
  - go to Settings > Privacy > Device administration > uncheck Verify apps
  - re-install Locus Map
 
Method for **rooted devices**:
  - use [[https://play.google.com/store/apps/details?id=com.keramidas.TitaniumBackup|Titanium backup]] 
  - backup the //com.securitycore.miui_t1.0// 
  - uninstall //com.securitycore.miui_t1.0// 
  - download and install Locus from Google Play store
According to our users' experience a few other ways work as well:
  * factory reset of the device
  * re-installation of Google Play Store application
  * removing Google account and adding it back

==== Error - 26 ====
This error is concerning Xiaomi again but this has nothing to do with Play Store. Error -26 is related to MIUI's package manager and translates to INSTALL_FAILED_SYSTEM_INCOMPATIBLE. So, it is MIUI who is preventing the install.  Somehow MIUI thinks that the apk is incompatible.

**Solution**
  * try to downgrade your MIUI to the version that did not block Locus Map installation
  * block automatic updating of your MIUI
  * wait for a new version that hopefully will be fixed