Dear All I am new here. So, I have read the manual and seen nothing to solve this problem. According to manuual whenever i am going to add a new patron. It can not. At the first time when i was logged in following warning message shows and that is "You are logged in as the database administrative user. This is not recommended because some parts of Koha will not function as expected when using this account. Please log in instead with a regular staff account. To create a staff account, create a library, a patron category 'Staff' and add a new patron. Then give this patron permissions from 'More' in the toolbar." According to the message i went to the top of the site to set library from there i chose the canterville. After that i clicked on create patron>new patron and from drop down menu choose staff. There a message came that is "can not add patron. please add a patron category." So i clicked on the patron category. There i add a new patron category named College Staff. Again i continued but again this message comes. At last i went to tools>patron list> new patron> create a new patron list> Give name "Staff">save and following message comes. Software error: Can't call method "patron_list_id" on an undefined value at /usr/share/koha/intranet/cgi-bin/patron_lists/add-modify.pl line 55. For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error. How can i fix it? I have no idea. Please help me. Even i can not open the list. There also show same type message. By the way I have installed on the following Koha version-16.05.00.000 server platform- ubuntu 16.04 LTS amd64 method of installation-marc21 Thanks in advance. Regards Mahmud