Error flow-flow SafeMySQL

Hi, I installed it flow-flow
But this error appears to me please help

Thank

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An E_ERROR error occurred due to line 647 in the /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/db/SafeMySQL.php file. Error message: Uncaught Exception: flow \ db \ SafeMySQL: ALTER command denied to user ‘ngif_frdf197’ @ ‘localhost’ for table ‘wp_ff_posts’. Full query: [ALTER TABLE wp_ff_posts MODIFYuser_pic VARCHAR (700)] in /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/db/SafeMySQL.php:647
Stack trace:
# 0 /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/db/SafeMySQL.php(507): flow \ db \ SafeMySQL-> error ()
# 1 /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/db/SafeMySQL.php(145): flow \ db \ SafeMySQL-> rawQuery ()
# 2 /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/db/migrations/FFMigration_3_12.php query(28): flow \ db \ SafeMySQL-> ()
# 3 /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/core/db/LADBMigrationManager.php(46): flow \ db \ migrations \ FFMigration_3_12-> execute ()
# 4 /home/ngif/public_html/wp-content/plugins/flow-flow-social-streams/includes/FlowFlowActivator.php(113): la \ core \ db \ LADBMigrat