Membership module error

installed on 7.2, when clicking on module in admin - modules, I get the following error

Fatal error: Class 'BxDolAdminSettings' not found in /mysite/modules/boonex/membership/classes/BxMbpModule.php on line 85

Open and edit this file:

/modules/boonex/membership/classes/BxMbpModule.php

Add the following on line 85:

bx_import('BxDolAdminSettings');

Should look like this:

81 $iId = (int)$this->_oDb->getOne("SELECT `ID` FROM `sys_options_cats` WHERE `name`='Membership'");

82 if(empty($iId))

83 return MsgBox('_membership_txt_empty');

84

85 bx_import('BxDolAdminSettings');

86 $oSettings = new BxDolAdminSettings($iId, BX_DOL_URL_ROOT . $this->_oConfig->getBaseUri() . 'admin');

87 $sResult = $oSettings->getForm();

SAVE IT!

Or alternatively, make sure the Payment module is installed and selected under Admin Panel => Settings => Advanced Settings. Only option for the module is to disable free join, which requires payment, anyway.