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		#1 | 
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			 Junior Member 
			
			![]() Posts: 7 
				Karma: 10 
				Join Date: Nov 2018 
				
				
				
				Device: Paperwhite 
				
				
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				Calibre stopped Working
			 
			
			
			Hello, 
		
	
		
		
		
		
		
		
		
		
		
		
	
	I have a little problem with calibre. I can not open any Books nor can i add any Book. I deinstalled Calibre, deleted the Config files and then reinstalled it (not using the old Bibliotek). But still same problem. When adding a Book i get this message: Failed to start worker process Traceback (most recent call last): File "site-packages\calibre\utils\ipc\pool.py", line 201, in start_worker File "site-packages\calibre\utils\ipc\pool.py", line 191, in create_worker File "site-packages\calibre\utils\ipc\__init__.py", line 22, in eintr_retry_call IOError: [Errno 22] Invalid argument I deactivated my Antivirus Program (G-data) but nothing changed. I hope someone can help!  | 
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		#2 | 
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			 null operator (he/him) 
			
			![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 22,018 
				Karma: 30277294 
				Join Date: Mar 2012 
				Location: Sydney Australia 
				
				
				Device: none 
				
				
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			See third and fourth item in Calibre FAQ:Miscellaneous here 
		
	
		
		
		
		
		
		
		
		
		
		
	
	First thing to try is running calibre in safe mode, if that works you need to figure out what process is blocking calibre. BR  | 
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