@litvinovg Is your modification work on 3_0_1-1? I tried to change files on my test site. Get errors when trying to add new author
[Sun Dec 03 14:19:55 2017] [warn] [client 213.129.40.141] mod_fcgid: stderr: PHP Notice: Array to string conversion in /home/mzsvfu/public_html/lib/pkp/classes/submission/PKPAuthorDAO.inc.php on line 221, referer: http://www.mzsvfu.ru/index.php/mz/submission/wizard/1?submissionId=2
[Sun Dec 03 14:19:55 2017] [warn] [client 213.129.40.141] mod_fcgid: stderr: PHP Notice: Array to string conversion in /home/mzsvfu/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 1021, referer: http://www.mzsvfu.ru/index.php/mz/submission/wizard/1?submissionId=2
[Sun Dec 03 14:19:55 2017] [warn] [client 213.129.40.141] mod_fcgid: stderr: PHP Notice: Array to string conversion in /home/mzsvfu/public_html/lib/pkp/lib/adodb/adodb.inc.php on line 1021, referer: http://www.mzsvfu.ru/index.php/mz/submission/wizard/1?submissionId=2
[Sun Dec 03 14:19:55 2017] [warn] [client 213.129.40.141] mod_fcgid: stderr: ojs2: DB Error: Unknown column ‘Array’ in ‘field list’, referer: http://www.mzsvfu.ru/index.php/mz/submission/wizard/1?submissionId=2