error after activating

i got the follow message from the debug on the top of my backend screen after activate the plugin:

"Strict Standards: Non-static method IS_IU_Import_Users::init() should not be called statically in /Users/miasamacmini/10Sites/miasapro/wp-content/plugins/import-users-from-csv-master/import-users-from-csv.php on line 378

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method IS_IU_Import_Users::process_csv() should not be called statically in /Users/miasamacmini/10Sites/miasapro/wp-includes/plugin.php on line 470

Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method IS_IU_Import_Users::add_admin_pages() should not be called statically in /Users/miasamacmini/10Sites/miasapro/wp-includes/plugin.php on line 470
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Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method IS_IU_Import_Users::users_page() should not be called statically in /Users/miasamacmini/10Sites/miasapro/wp-includes/plugin.php on line 470"

this is my wordpress installation on my local environment:

WP Version: 3.9.1
WP Multisite Enabled: No
Web Server Info: Apache/2.2.26 (Unix) mod_fastcgi/2.4.6 mod_wsgi/3.4 Python/2.7.6 PHP/5.5.10 mod_ssl/2.2.26 OpenSSL/0.9.8y DAV/2 mod_perl/2.0.8 Perl/v5.18.2
PHP Version: 5.5.10
MySQL Version: 5.5.34
WP Memory Limit: 256 MB
WP Debug Mode: Yes
WP Language: Default
WP Max Upload Size: 32 MB
PHP Post Max Size: 32 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
SUHOSIN Installed: No

Plugins
Installed Plugins: Adminimize by Frank Bültge version 1.8.4,
Advanced Custom Fields by Elliot Condon version 4.3.8,
Akismet by Automattic version 3.0.0,
Contact Form 7 by Takayuki Miyoshi version 3.8.1,
Disable Feeds by Samir Shah version 1.3,
Export Users to CSV by Ulrich Sossou version 1.0.0,
Features by WooThemes version 1.4.2,
Google Analytics for WordPress by Joost de Valk version 4.3.5,
ImageMagick Engine by Orangelab version 1.5.1,
Import Users from CSV by Ulrich Sossou version 1.0.0,
Simple Image Sizes by Rahe version 3.0,
Stream by Stream version 1.4.6,
User Role Editor by Vladimir Garagulya version 4.14.1,
WooCommerce Gateways Country Limiter by OnTheGoSystems version 1.0.2,
WooCommerce MailChimp by Adam Anderly version 1.3.1,
WooCommerce by WooThemes version 2.1.10,
WooDojo by WooThemes version 1.5.4,
WP Email Template LITE by A3 Revolution version 1.1.2

Settings
Force SSL: No

https://wordpress.org/plugins/import-users-from-csv/