Php excel file uploading error

Hello, I have a php application that uploading info from excel in mysql database. Everything has been ok until 2 weeks when I got one error when uploading file. Nothing has been changed in the app, so this can be related with server update or something. Here is the error: Fatal error: Uncaught exception 'Zend_Search_Lucene_Exception' with message 'Index is under processing now' in /home/sapade5/public_html/numiscatalog/catalog/vendor/zf1/zend-search-lucene/library/Zend/Search/[login to view URL] Stack trace: #0 /home/sapade5/public_html/numiscatalog/catalog/vendor/zf1/zend-search-lucene/library/Zend/Search/[login to view URL](529): Zend_Search_Lucene::getActualGeneration(Object(Zend_Search_Lucene_Storage_Directory_Filesystem)) #1 /home/sapade5/public_html/numiscatalog/catalog/vendor/zf1/zend-search-lucene/library/Zend/Search/[login to view URL](225): Zend_Search_Lucene->__construct('/home/sapade5/p...', false) #2 /home/sapade5/public_html/numiscatalog/catalog/utils/[login to view URL](20): Zend_Search_Lucene::open('/home/sapade5/p...') #3 /home/sapade5/public_html/numiscatalog/catalog/admin/controllers/[login to view URL](272): SearchEngine->__construct() #4 /home/sapade5/public_html/numiscatalog/catalog/admin/controllers/[login to view URL](87): saveData(Object(PHPExcel), 0, Array, Array) #5 /home/sa in /home/sapade5/public_html/numiscatalog/catalog/vendor/zf1/zend-search-lucene/library/Zend/Search/[login to view URL] on line 297 I can supply a ftp access. That shouldn't be a big issue. Thank you