I can't add a map whith Carta plugin

Hi !
I use Carta plugin, but when I want add a new map, I I get lots of error messages, like this :

« Notice: Undefined variable: carta in /var/www/html/omeka/plugins/Carta/views/admin/index/manage.php on line 8

Notice: Trying to get property of non-object in /var/www/html/omeka/plugins/Carta/views/admin/index/manage.php on line 8

Notice: Undefined variable: carta in /var/www/html/omeka/plugins/Carta/views/admin/index/manage.php on line 9

Notice: Trying to get property of non-object in /var/www/html/omeka/plugins/Carta/views/admin/index/manage.php on line 9

Notice: Undefined variable: carta in /var/www/html/omeka/plugins/Carta/views/admin/index/manage.php on line 11. »

And when I try to add a map anywy, when I click on “Save”, Omeka says this:

“Omeka encountered a mistake:
exception ‘Zend_Db_Statement_Mysqli_Exception’ with message ‘Mysqli statement execute error : Incorrect integer value: ‘’ for column ‘layergroup’ at row 1’ in /var/www/html/omeka/application/libraries/Zend/Db/Statement/Mysqli.php:214
Stack trace:
#0 /var/www/html/omeka/application/libraries/Zend/Db/Statement.php(303): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /var/www/html/omeka/application/libraries/Zend/Db/Adapter/Abstract.php(480): Zend_Db_Statement->execute(Array)
#2 [internal function]: Zend_Db_Adapter_Abstract->query(‘INSERT INTO ome…’)
#3 /var/www/html/omeka/application/libraries/Omeka/Db.php(79): call_user_func_array(Array, Array)
#4 /var/www/html/omeka/plugins/Carta/models/Table/Carta.php(35): Omeka_Db->__call(‘query’, Array)
#5 /var/www/html/omeka/plugins/Carta/models/Table/Carta.php(35): Omeka_Db->query(‘INSERT INTO ome…’)
#6 /var/www/html/omeka/plugins/Carta/controllers/IndexController.php(50): Table_Carta->insert(Array)
#7 /var/www/html/omeka/application/libraries/Zend/Controller/Action.php(516): Carta_IndexController->saveAction()
#8 /var/www/html/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch(‘saveAction’)
#9 /var/www/html/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#10 /var/www/html/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#11 /var/www/html/omeka/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#12 /var/www/html/omeka/application/libraries/Omeka/Application.php(77): Zend_Application->run()
#13 /var/www/html/omeka/admin/index.php(28): Omeka_Application->run()
#14 {main}”

I have examined the file’s plugin ‘manage.php’ but I don’t understand what is the variable undefined. I have downloaded the last version of Carta plugin but the problem is still here. Would you know what the problem is? I thank you in advance