Update controller.php
Strict standards: Only variables should be assigned by reference.
Update view.html.php
Strict standards. 

Declaration of fieldsattachModelfieldsattachgroup::delete() should be compatible with JModelAdmin::delete(&$pks).
Strict standards 

Declaration of fieldsattachTablefieldsattachgroup::publish() should be compatible with JTable::publish($pks = NULL, $state = 1, $userId = 0)
Strict standards 

Declaration of fieldsattachModelfieldsattachunidad::delete() should be compatible with JModelAdmin::delete(&$pks)
Strict standards 

Declaration of fieldsattachTablefieldsattachunidad::publish() should be compatible with JTable::publish($pks = NULL, $state = 1, $userId = 0)
Strict standards 

Strict standards: Only variables should be assigned by reference.
Strict standards 

Strict standards: Only variables should be assigned by reference.
Delete system_fieldsattachment.zip
updated
Merge pull request #12 from mikoweb/master

THANKS!!! I need fix this in all component!!! thanks!!!!