What Is Facebook Error Code 19?
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Unlike other errors that people experience when trying to download Facebook or any other app from Google Play Store, this one is not that common. In reality, the error code 19 happens when you have insufficient storage space (either internal memory or on SD card, depending on where your apps are being installed). This also means it’s not strictly linked to Facebook but the app is hugely popular, so it might be associated more often than not.
That being said, you can do a few things to clear your storage apart from uninstalling some apps. As this is an unusual error, the “fixes” are basically deleting or moving your apps from internal to external storage. In any case, here’s what you can do to fix this error.