| 
			
			 | 
		#1 | 
| 
			
			
			
			 Connoisseur 
			
			![]() Posts: 51 
				Karma: 10 
				Join Date: Apr 2014 
				
				
				
				Device: sony e-reader 
				
				
				 | 
	
	
	
		
		
			
			 
			
			Hello, 
		
	
		
		
		
		
		
		
		
		
		
		
	
	I keep getting this error when I am adding books: Failed to write data to address: \\.\pipe\CalibreGUI-xxxx with error: Unknown error I noticed it happened when I updated to 5.0  | 
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#2 | 
| 
			
			
			
			 Member Retired 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 805 
				Karma: 2091358 
				Join Date: May 2019 
				
				
				
				Device: Kindle Oasis 1st Gen, PB Era 
				
				
				 | 
	
	
	
		
		
		
		
		 
			
			What O/S, what version of the O/S and where, exactly, is your library stored?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
	 | 
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#3 | 
| 
			
			
			
			 Grand Sorcerer 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 13,698 
				Karma: 79983758 
				Join Date: Nov 2007 
				Location: Toronto 
				
				
				Device: Libra H2O, Libra Colour 
				
				
				 | 
	
	
	
		
		
		
		
		 
			
			I suspect it's antivirus
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
	 | 
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#4 | 
| 
			
			
			
			 Bibliophagist 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 48,175 
				Karma: 174315444 
				Join Date: Jul 2010 
				Location: Vancouver 
				
				
				Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos 
				
				
				 | 
	
	|
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#5 | |
| 
			
			
			
			 Connoisseur 
			
			![]() Posts: 51 
				Karma: 10 
				Join Date: Apr 2014 
				
				
				
				Device: sony e-reader 
				
				
				 | 
	
	
	
		
		
		
		
		 Quote: 
	
 I have upgraded to 5.4.2 64bit and my OS is Windows 10. I have my calibre library saved on my PC -Programs. I have Kaspersky virus protection.  | 
|
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#6 | 
| 
			
			
			
			 creator of calibre 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 45,609 
				Karma: 28549044 
				Join Date: Oct 2006 
				Location: Mumbai, India 
				
				
				Device: Various 
				
				
				 | 
	
	
	
		
		
		
		
		 
			
			How are you adding books?
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
	 | 
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#7 | 
| 
			
			
			
			 Connoisseur 
			
			![]() Posts: 51 
				Karma: 10 
				Join Date: Apr 2014 
				
				
				
				Device: sony e-reader 
				
				
				 | 
	
	|
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
| 
			
			 | 
		#8 | 
| 
			
			
			
			 creator of calibre 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 45,609 
				Karma: 28549044 
				Join Date: Oct 2006 
				Location: Mumbai, India 
				
				
				Device: Various 
				
				
				 | 
	
	
	
		
		
		
		
		 
			
			drag and drop will not generate that error. You could get that error when double clicking. It will happen if communicating between the calibre instance called to add the books and the running calibre fails. This typically happens because of an antivirus program interfering. To confirm try running windows in safe mode and see if the problem goes away.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
	 | 
| 
		 | 
	
	
	
		
		
		
		
			 
		
		
		
		
		
		
		
			
		
		
		
	 | 
![]()  | 
            
        
    
            
  | 
    
			 
			Similar Threads
		 | 
	||||
| Thread | Thread Starter | Forum | Replies | Last Post | 
| ERROR: Failed: Failed to export data | Funkybassman | Library Management | 3 | 05-09-2020 08:22 AM | 
| Error:Failed to create library: Failed | wolfkin | Library Management | 1 | 06-18-2019 05:42 PM | 
| Failed feed: Tips_<urlopen error [Errno 11004] getaddrinfo failed> | Danesh | Recipes | 4 | 03-19-2015 04:45 AM | 
| Calibre Error: Failed to redirect stdout/stderr to NUL. | TeddyTwice | Devices | 4 | 02-11-2015 11:49 AM | 
| ERROR: Failed to create library: Failed to create calibre library at: u'F:\\Calibre B | feenix1363 | Calibre | 1 | 05-10-2012 06:45 PM |