Error uploading a pdf file and saving

I am trying to upload a pdf and when I save the snaheges for my item I get the following error : “Omeka_File_Derivative_Exception. ImageMagick is not properly configured: invalid directory given for the ImageMagick command!”

This is the trace of my problem:
Omeka_File_Derivative_Exception: ImageMagick is not properly configured: invalid directory given for the ImageMagick command! in C:\xampp\htdocs\omeka\application\libraries\Omeka\File\Derivative\Strategy\ExternalImageMagick.php:82
Stack trace:
#0 C:\xampp\htdocs\omeka\application\libraries\Omeka\File\Derivative\Strategy\ExternalImageMagick.php(38): Omeka_File_Derivative_Strategy_ExternalImageMagick->_getConvertPath()
#1 C:\xampp\htdocs\omeka\application\libraries\Omeka\File\Derivative\Creator.php(76): Omeka_File_Derivative_Strategy_ExternalImageMagick->createImage(‘C:\Windows\TEMP…’, ‘C:\Windows\TEMP…’, ‘fullsize’, 800, ‘application/pdf’)
#2 C:\xampp\htdocs\omeka\application\models\File.php(356): Omeka_File_Derivative_Creator->create(‘C:\Windows\TEMP…’, ‘1b02bd3c0333506…’, ‘application/pdf’)
#3 C:\xampp\htdocs\omeka\application\models\Job\FileProcessUpload.php(22): File->createDerivatives()
#4 C:\xampp\htdocs\omeka\application\libraries\Omeka\Job\Dispatcher\Adapter\Synchronous.php(25): Job_FileProcessUpload->perform()
#5 C:\xampp\htdocs\omeka\application\libraries\Omeka\Job\Dispatcher\Default.php(137): Omeka_Job_Dispatcher_Adapter_Synchronous->send(‘{“className”:"J…’, Array)
#6 C:\xampp\htdocs\omeka\application\models\File.php(203): Omeka_Job_Dispatcher_Default->send(‘Job_FileProcess…’, Array)
#7 C:\xampp\htdocs\omeka\application\libraries\Omeka\Record\AbstractRecord.php(280): File->afterSave(Array)
#8 C:\xampp\htdocs\omeka\application\libraries\Omeka\Record\AbstractRecord.php(548): Omeka_Record_AbstractRecord->runCallbacks(‘afterSave’, Array)
#9 C:\xampp\htdocs\omeka\application\models\Item.php(336): Omeka_Record_AbstractRecord->save()
#10 C:\xampp\htdocs\omeka\application\models\Builder\Item.php(203): Item->saveFiles()
#11 C:\xampp\htdocs\omeka\application\libraries\globals.php(567): Builder_Item->addFiles(‘Upload’, ‘file’, Array)
#12 C:\xampp\htdocs\omeka\application\models\Item.php(321): insert_files_for_item(Object(Item), ‘Upload’, ‘file’, Array)
#13 C:\xampp\htdocs\omeka\application\models\Item.php(231): Item->_uploadFiles()
#14 C:\xampp\htdocs\omeka\application\libraries\Omeka\Record\AbstractRecord.php(280): Item->beforeSave(Array)
#15 C:\xampp\htdocs\omeka\application\libraries\Omeka\Record\AbstractRecord.php(529): Omeka_Record_AbstractRecord->runCallbacks(‘beforeSave’, Array)
#16 C:\xampp\htdocs\omeka\application\libraries\Omeka\Controller\AbstractActionController.php(229): Omeka_Record_AbstractRecord->save(false)
#17 C:\xampp\htdocs\omeka\application\controllers\ItemsController.php(88): Omeka_Controller_AbstractActionController->editAction()
#18 C:\xampp\htdocs\omeka\application\libraries\Zend\Controller\Action.php(516): ItemsController->editAction()
#19 C:\xampp\htdocs\omeka\application\libraries\Zend\Controller\Dispatcher\Standard.php(308): Zend_Controller_Action->dispatch(‘editAction’)
#20 C:\xampp\htdocs\omeka\application\libraries\Zend\Controller\Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#21 C:\xampp\htdocs\omeka\application\libraries\Zend\Application\Bootstrap\Bootstrap.php(105): Zend_Controller_Front->dispatch()
#22 C:\xampp\htdocs\omeka\application\libraries\Zend\Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#23 C:\xampp\htdocs\omeka\application\libraries\Omeka\Application.php(73): Zend_Application->run()
#24 C:\xampp\htdocs\omeka\admin\index.php(28): Omeka_Application->run()
#25 {main}

Can Someone help me?

I have a problem in similar conditions, when trying to upload any type of file I get this error message and this trace:
exception ‘Omeka_File_Derivative_Exception’ with message ‘Failed to execute command: ‘/usr/bin/convert’ ‘/tmp/7fe60f918c6a11d0993b020ac28d9e34.pdf[0]’ -auto-orient -background white +repage -flatten -thumbnail ‘800x800>’ ‘/tmp/fullsize_7fe60f918c6a11d0993b020ac28d9e34.jpg’.’ in /home/mendozal/public_html/omeka/application/libraries/Omeka/File/Derivative/Strategy/ExternalImageMagick.php:210
Stack trace:
#0 /home/mendozal/public_html/omeka/application/libraries/Omeka/File/Derivative/Strategy/ExternalImageMagick.php(48): Omeka_File_Derivative_Strategy_ExternalImageMagick::executeCommand(‘’/usr/bin/conve…‘, NULL, NULL, NULL)
#1 /home/mendozal/public_html/omeka/application/libraries/Omeka/File/Derivative/Creator.php(76): Omeka_File_Derivative_Strategy_ExternalImageMagick->createImage(’/tmp/7fe60f918c…‘, ‘/tmp/fullsize_7…’, ‘fullsize’, 800, ‘application/pdf’)
#2 /home/mendozal/public_html/omeka/application/models/File.php(356): Omeka_File_Derivative_Creator->create(’/tmp/7fe60f918c…‘, ‘7fe60f918c6a11d…’, ‘application/pdf’)
#3 /home/mendozal/public_html/omeka/application/models/Job/FileProcessUpload.php(22): File->createDerivatives()
#4 /home/mendozal/public_html/omeka/application/libraries/Omeka/Job/Dispatcher/Adapter/Synchronous.php(25): Job_FileProcessUpload->perform()
#5 /home/mendozal/public_html/omeka/application/libraries/Omeka/Job/Dispatcher/Default.php(137): Omeka_Job_Dispatcher_Adapter_Synchronous->send(’{“className”:"J…', Array)
#6 /home/mendozal/public_html/omeka/application/models/File.php(203): Omeka_Job_Dispatcher_Default->send(‘Job_FileProcess…’, Array)
#7 [internal function]: File->afterSave(Array)
#8 /home/mendozal/public_html/omeka/application/libraries/Omeka/Record/AbstractRecord.php(280): call_user_func(Array, Array)
#9 /home/mendozal/public_html/omeka/application/libraries/Omeka/Record/AbstractRecord.php(548): Omeka_Record_AbstractRecord->runCallbacks(‘afterSave’, Array)
#10 /home/mendozal/public_html/omeka/application/models/Item.php(336): Omeka_Record_AbstractRecord->save()
#11 /home/mendozal/public_html/omeka/application/models/Builder/Item.php(203): Item->saveFiles()
#12 /home/mendozal/public_html/omeka/application/libraries/globals.php(567): Builder_Item->addFiles(‘Upload’, ‘file’, Array)
#13 /home/mendozal/public_html/omeka/application/models/Item.php(321): insert_files_for_item(Object(Item), ‘Upload’, ‘file’, Array)
#14 /home/mendozal/public_html/omeka/application/models/Item.php(231): Item->_uploadFiles()
#15 [internal function]: Item->beforeSave(Array)
#16 /home/mendozal/public_html/omeka/application/libraries/Omeka/Record/AbstractRecord.php(280): call_user_func(Array, Array)
#17 /home/mendozal/public_html/omeka/application/libraries/Omeka/Record/AbstractRecord.php(529): Omeka_Record_AbstractRecord->runCallbacks(‘beforeSave’, Array)
#18 /home/mendozal/public_html/omeka/application/libraries/Omeka/Controller/AbstractActionController.php(229): Omeka_Record_AbstractRecord->save(false)
#19 /home/mendozal/public_html/omeka/application/controllers/ItemsController.php(88): Omeka_Controller_AbstractActionController->editAction()
#20 /home/mendozal/public_html/omeka/application/libraries/Zend/Controller/Action.php(516): ItemsController->editAction()
#21 /home/mendozal/public_html/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch(‘editAction’)
#22 /home/mendozal/public_html/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#23 /home/mendozal/public_html/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#24 /home/mendozal/public_html/omeka/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#25 /home/mendozal/public_html/omeka/application/libraries/Omeka/Application.php(73): Zend_Application->run()
#26 /home/mendozal/public_html/omeka/admin/index.php(28): Omeka_Application->run()
#27 {main}

Can Someone help me?