The plugin generated 3896 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

[ElevenMou]

After activated the plugin I received this error:

Deprecated: Return type of Ai1wm_Recursive_Directory_Iterator::hasChildren($allow_links = true) should either be compatible with RecursiveDirectoryIterator::hasChildren(bool $allowLinks = false): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\iterator\class-ai1wm-recursive-directory-iterator.php on line 57

Deprecated: Return type of Ai1wm_Recursive_Directory_Iterator::rewind() should either be compatible with FilesystemIterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\iterator\class-ai1wm-recursive-directory-iterator.php on line 35

Deprecated: Return type of Ai1wm_Recursive_Directory_Iterator::next() should either be compatible with DirectoryIterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\iterator\class-ai1wm-recursive-directory-iterator.php on line 42

Deprecated: Return type of Ai1wm_Recursive_Extension_Filter::getChildren() should either be compatible with RecursiveFilterIterator::getChildren(): ?RecursiveFilterIterator, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\filter\class-ai1wm-recursive-extension-filter.php on line 47

Deprecated: Return type of Ai1wm_Recursive_Extension_Filter::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\filter\class-ai1wm-recursive-extension-filter.php on line 37

Deprecated: Return type of Ai1wm_Recursive_Exclude_Filter::getChildren() should either be compatible with RecursiveFilterIterator::getChildren(): ?RecursiveFilterIterator, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\filter\class-ai1wm-recursive-exclude-filter.php on line 41

Deprecated: Return type of Ai1wm_Recursive_Exclude_Filter::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\filter\class-ai1wm-recursive-exclude-filter.php on line 37

Deprecated: Return type of Ai1wm_Recursive_Newline_Filter::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\Users\Dell\Mine\babel\Frontend\Wordpress\CPVC\app\public\wp-content\plugins\All-In-One-WP-Migration-With-Import-master\lib\vendor\servmask\filter\class-ai1wm-recursive-newline-filter.php on line 28