Email not sending (Outcomes status Failed)

Hello there,

I am having problems with the automation.
Emails don’t work.
the outcome log says:

Message error:

Call to undefined function WPDesk\ShopMagic\Action\Builtin\SendMail\mime_content_type()

Error Code: 0

Trace:

#0 /public_html/wp-content/plugins/shopmagic-for-woocommerce/src/Action/Builtin/SendMail/AbstractSendMailAction.php(137): WPDesk\\ShopMagic\\Action\\Builtin\\SendMail\\AbstractSendMailAction->get_attachments()
#1 /public_html/wp-content/plugins/shopmagic-for-woocommerce/src/Action/Builtin/SendMail/AbstractSendMailAction.php(93): WPDesk\\ShopMagic\\Action\\Builtin\\SendMail\\AbstractSendMailAction->execute_internal(\'myemailtest@gmail....\')
#2 /public_html/wp-content/plugins/shopmagic-for-woocommerce/src/ActionExecution/ExecuteNow.php(66): WPDesk\\ShopMagic\\Action\\Builtin\\SendMail\\AbstractSendMailAction->execute(Object(WPDesk\\ShopMagic\\Automation\\Automation), Object(WPDesk\\ShopMagic\\Event\\Builtin\\OrderPaid))
#3 /public_html/wp-content/plugins/shopmagic-for-woocommerce/src/ActionExecution/QueueExecutionStrategyFactory.php(164): WPDesk\\ShopMagic\\ActionExecution\\ExecuteNow->execute(Object(WPDesk\\ShopMagic\\Automation\\Automation), Object(WPDesk\\ShopMagic\\Event\\Builtin\\OrderPaid), Object(WPDesk\\ShopMagic\\Action\\Builtin\\SendMail\\SendMailAction), 0, \'62\')
#4 /public_html/wp-content/plugins/shopmagic-for-woocommerce/src/ActionExecution/QueueExecutionStrategyFactory.php(168): WPDesk\\ShopMagic\\ActionExecution\\QueueExecutionStrategyFactory->WPDesk\\ShopMagic\\ActionExecution\\{closure}()
#5 /public_html/wp-includes/class-wp-hook.php(305): WPDesk\\ShopMagic\\ActionExecution\\QueueExecutionStrategyFactory->run_action(Array, Array, Array, 0, \'62\')
#6 /public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(\'\', Array)
#7 /public_html/wp-includes/plugin.php(518): WP_Hook->do_action(Array)
#8 /public_html/wp-content/plugins/woocommerce/packages/action-scheduler/classes/actions/ActionScheduler_Action.php(22): do_action_ref_array(\'shopmagic/core/...\', Array)
#9 /public_html/wp-content/plugins/woocommerce/packages/action-scheduler/classes/abstracts/ActionScheduler_Abstract_QueueRunner.php(65): ActionScheduler_Action->execute()
#10 /public_html/wp-content/plugins/woocommerce/packages/action-scheduler/classes/ActionScheduler_QueueRunner.php(162): ActionScheduler_Abstract_QueueRunner->process_action(6904, \'WP Cron\')
#11 /public_html/wp-content/plugins/woocommerce/packages/action-scheduler/classes/ActionScheduler_QueueRunner.php(132): ActionScheduler_QueueRunner->do_batch(25, \'WP Cron\')
#12 /public_html/wp-includes/class-wp-hook.php(303): ActionScheduler_QueueRunner->run(\'WP Cron\')
#13 /public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(\'\', Array)
#14 /public_html/wp-includes/plugin.php(518): WP_Hook->do_action(Array)
#15 /public_html/wp-cron.php(138): do_action_ref_array(\'action_schedule...\', Array)
#16 {main}

ShopMagic version 2.31.2
Woocommerce version 5.7.1
Wordpress version 5.8.1

Any idea what may be generating the error?

I appreciate your help.