Just install the module, open config page /admin/privatbank/settings and save it, got a warnings:

    * warning: fopen(pblog.txt) [function.fopen]: failed to open stream: Permission denied in /var/www/drupal/sites/all/modules/privatbank/privatbank.pages.inc on line 385.
    * warning: fwrite(): supplied argument is not a valid stream resource in /var/www/drupal/sites/all/modules/privatbank/privatbank.pages.inc on line 386.
    * warning: fwrite(): supplied argument is not a valid stream resource in /var/www/drupal/sites/all/modules/privatbank/privatbank.pages.inc on line 387.
    * warning: fclose(): supplied argument is not a valid stream resource in /var/www/drupal/sites/all/modules/privatbank/privatbank.pages.inc on line 388.

Comments

Anonymous’s picture

Anonymous (not verified) commented

It seems like you don't have write permissions on desired directory. Do chmod 777 on it.
Or, if you do not need logs, just comment appropriate code in privatbank.pages.inc to turn off logging.

Nick Fedchik’s picture

Nick Fedchik commented

It is not secure to set 777 permissions to sites/all/modules directory. Even to a sites/all/modules/the_module directory.

Anonymous’s picture

Anonymous (not verified) commented

So, create pblog.txt file and set permissions 777 on it.