Strange Error with migration


I make a migration of all the wordpress with content and theme integrated , and in the dashboard appears this message

 Strict Standards: Declaration of TGM_Bulk_Installer_Skin::before() should be compatible with Bulk_Upgrader_Skin::before($title = '') in /var/www/vhost/ on line 1893

Strict Standards: Declaration of TGM_Bulk_Installer_Skin::after() should be compatible with Bulk_Upgrader_Skin::after($title = '') in /var/www/vhost/ on line 1893

whats the problem? solution? 



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