Error communicating with device

[Katvis]

Hi – re Error communicating with device
• A description of the problem: on connecting the iPad, I get error message: Error communicating with device. Error details:
o Traceback (most recent call last):
o File "site-packages\calibre\gui2\device.py", line 87, in run
o File "site-packages\calibre\gui2\device.py", line 584, in _upload_books
o File "site-packages\calibre\devices\interface.py", line 412, in upload_books
o NotImplementedError
• The specific steps to recreate the problem: connect iPad with Calibre running or if I right click to send a book to device
• The version of calibre I am using: 2.50.1 [64 bit]
• Calibre's language setting: English
• Operating system: Windows 8.1, 64-bit
• The version of iTunes installed on your system
o iOS: 8.3
o Windows: iTunes version 12.3.2.35
• The version of the plugin installed: iOS reader application (1.4.7.0.0)
• The preferred reader application selected in the configuration dialog: iBOOKS
• A description of your iDevice including cellular technology/provider: iPad (3rd generation - iOS 8.3)
Confirming:
• Confirm that Sync with this iPad over Wi-Fi is disabled in iTunes
• Enable Manually manage videos or Manually manage music and videos
• Disconnect your iDevice, then do a hard reset
• Confirm that you have a single iDevice physically connected to your computer
• Customize plugin: In the Preferred iOS reader application combo box, select iBooks

When running debug device detection i get: "calibre, version 2.50.1
ERROR: Device already detected: A device (iOS reader applications) is already detected by calibre. If you wish to debug the detection of another device, first disconnect this device"

Thanks in advance for assistance

[HarryT]

Calibre can't directly send books directly to the iPad. Do a "Save to Disk" from within Calibre, and then drag and drop the files from the folder in which you've saved them onto the "Books" tab of iTunes.