MobileRead Forums - View Single Post - Failed to get children from device: IDispatch error #7689

jackb · 05-16-2021, 05:54 PM

Hello,

FYI, I have an update. It's looking as if there is a compatibility issue with Android 11. I'd guess it is a timing issue when Android 11 is accessing the SD card, but that is a guess.

Today I removed the SD card out of the phone and put it into my PC. I formatted it with the Windows formatter long version to check for any bad bits. No problems so far.

But when I put the SD card into the phone I ran into the original error "Failed to get children from device: IDispatch error #7689". I put the SD card back into the PC was able to put books onto it using the Calibre "Connect to Folder" function. No problems at all.

I put the SD card into the phone and all the preloaded books can be read just fine using ReadEra. I then tried to connect Calibre using USB and it failed again. But then I connected the phone to Calibre using wifi and that worked just fine. Repeat, I was able to download a book from Calibre to the phone using wifi.

I am using a PC running Windows 10 OS Build 19041.985 and Feature Pack 120.2212.2020.0
I am using a Moto Power G running Android 11 version RPM31.Q1-54-13.

This fails when connecting via USB and Android 11.
This worked when connecting via USB and Android 10.
This works when connecting via wifi and Android 11.

I am using ReadEra version 21.04.01+1460 to read the books that are stored on a 128 GB Sandisk SD card.

Hope this helps.
Jack

05-16-2021, 05:54 PM	#7
jackb Member Posts: 11 Karma: 10 Join Date: May 2021 Device: none	Hello, FYI, I have an update. It's looking as if there is a compatibility issue with Android 11. I'd guess it is a timing issue when Android 11 is accessing the SD card, but that is a guess. Today I removed the SD card out of the phone and put it into my PC. I formatted it with the Windows formatter long version to check for any bad bits. No problems so far. But when I put the SD card into the phone I ran into the original error "Failed to get children from device: IDispatch error #7689". I put the SD card back into the PC was able to put books onto it using the Calibre "Connect to Folder" function. No problems at all. I put the SD card into the phone and all the preloaded books can be read just fine using ReadEra. I then tried to connect Calibre using USB and it failed again. But then I connected the phone to Calibre using wifi and that worked just fine. Repeat, I was able to download a book from Calibre to the phone using wifi. I am using a PC running Windows 10 OS Build 19041.985 and Feature Pack 120.2212.2020.0 I am using a Moto Power G running Android 11 version RPM31.Q1-54-13. This fails when connecting via USB and Android 11. This worked when connecting via USB and Android 10. This works when connecting via wifi and Android 11. I am using ReadEra version 21.04.01+1460 to read the books that are stored on a 128 GB Sandisk SD card. Hope this helps. Jack