Error after activation

Error after activation. No other plug-ins installed
WordPress version: 3.7.1
ОС: Ubuntu Server Edition
Apache: Apache/2.2.25-1-beget (Unix)
CPU`S: 8 * Intel(R) Xeon(R) CPU E5620 @ 2.40GHz
mysql: percona 5.1.70
RAM free: 1311 / 32179 Мб.
nginx: nginx/1.1.0
Perl: v5.10.1
PHP: 5.3.27
Python: Python 2.7.1+

Warning: chmod() has been disabled for security reasons in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 63

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/.htaccess) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 71

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 72

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 73

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/banlisttemp) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 273

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/banlist) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 277

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/ips) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 281

Warning: file(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/banlist) [function.file]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 284

Warning: implode() [function.implode]: Invalid arguments passed in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 284

Deprecated: Function eregi() is deprecated in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 288

Warning: file(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/banlisttemp) [function.file]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 295

Warning: Invalid argument supplied for foreach() in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 296

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/ips) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 303

Warning: fgets() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 304

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 305

Warning: fopen(/home/s/hostname/sitename/public_html/wp-content/iosec_admin/ips) [function.fopen]: failed to open stream: Permission denied in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 486

Warning: fputs() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 487

Warning: fclose() expects parameter 1 to be resource, boolean given in /home/s/hostname/sitename/public_html/wp-content/plugins/iosec-anti-flood-security-gateway-module/iosec.php on line 488

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