Beginner: ManyToManyFields error creating the model / adding values by the Admin Module or the Shell

Hi,

Sorry, via the admin interface (Web-GUI) I have inserted the following values:

My Actions

en

Language

mike.test // test@test.de

User

 

Dan Brown
Author

 

If I now try to add an Interest (“Dan Brown” and “en”) via the GUI selection I get:

TypeError at /admin/BookReminder/interest/add/

sequence item 0: expected string, ManyRelatedManager found

Request Method:	POST
Request URL:	http://127.0.0.1:8000/admin/BookReminder/interest/add/
Django Version:	1.7
Exception Type:	TypeError
Exception Value:	sequence item 0: expected string, ManyRelatedManager found
Exception Location:	D:\D-Project\SOL\BookReminder\models.py in __str__, line 39
Python Executable:	C:\Python27\python.exe
Python Version:	2.7.6
Python Path:	['D:\\D-Project\\SOL',  'C:\\Windows\\system32\\python27.zip',  'C:\\Python27\\DLLs',  'C:\\Python27\\lib',  'C:\\Python27\\lib\\plat-win',  'C:\\Python27\\lib\\lib-tk',  'C:\\Python27',  'C:\\Python27\\lib\\site-packages']
Server time:	Tue, 4 Nov 2014 18:48:34 +0100

 

So for me it looks like in the Model there is an error? Otherwise it should work via the GUI that gives me the two fields as input possibilites. The same happens, if I try to add the interesst by using the user in the admin interface and click there on "add" interest.

 

Best Regards,

Mike