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Steps to reproduce
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Expected behaviour
Tell us what should happen
Actual behaviour
After setup my owncloud server i actived the ldap app, i made and checked all the configuration correctly to import user from my LDAP server, but when i try to see the users list, i had this messege 
Error interno del servidor
El servidor ha encontrado un error y no puede completar la solicitud.
Por favor, contacte con el administrador del servidor si este error reaparece múltiples veces. Incluya asimismo los detalles técnicos que se muestran a continuación.
Pueden verse más detalles en el registro del servidor.
Server configuration
Operating system:Debian 8
Web server: Apache
Database:MySQL Server 5.5
PHP version:php 5.6.27
ownCloud version (see ownCloud admin page):9.0.4
Updated from an older ownCloud or fresh install:9.0.2
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption):
ownCloud log (data/owncloud.log)
Please paste possible errors in the following code block, see https://central.owncloud.org/t/how-to-find-webserver-or-oc-logfile-enable-php-logfile/808 for more info
Exception: {"Exception":"Exception","Message":"LDAP Operations error","Code":1,"Trace":"#0 \/var\/www\/oldcloud\/apps\/user_ldap\/lib\/ldap.php(71): OCA\\user_ldap\\lib\\LDAP->postFunctionCall()\n#1 \/var\/www\/oldcloud\/apps\/user_ldap\/lib\/access.php(897): OCA\\user_ldap\\lib\\LDAP->controlPagedResultResponse(Resource id #62, Resource id #63, NULL)\n#2 \/var\/www\/oldcloud\/apps\/user_ldap\/lib\/access.php(1042): OCA\\user_ldap\\lib\\Access->processPagedSearchStatus(Array, '(&(&(|(objectcl...', Array, 0, '500', NULL, true, false)\n#3 \/var\/www\/oldcloud\/apps\/user_ldap\/lib\/access.php(814): OCA\\user_ldap\\lib\\Access->search('(&(&(|(objectcl...', Array, Array, '500', NULL)\n#4 \/var\/www\/oldcloud\/apps\/user_ldap\/lib\/access.php(752): OCA\\user_ldap\\lib\\Access->searchGroups('(&(&(|(objectcl...', Array, '500', NULL)\n#5 \/var\/www\/oldcloud\/apps\/user_ldap\/group_ldap.php(803): OCA\\user_ldap\\lib\\Access->fetchListOfGroups('(&(&(|(objectcl...', Array, '500', NULL)\n#6 \/var\/www\/oldcloud\/apps\/user_ldap\/group_ldap.php(843): OCA\\user_ldap\\GROUP_LDAP->getGroupsChunk('', '500', NULL)\n#7 \/var\/www\/oldcloud\/lib\/private\/group\/manager.php(213): OCA\\user_ldap\\GROUP_LDAP->getGroups('', NULL, NULL)\n#8 \/var\/www\/oldcloud\/lib\/private\/group\/metadata.php(188): OC\\Group\\Manager->search('')\n#9 \/var\/www\/oldcloud\/lib\/private\/group\/metadata.php(90): OC\\Group\\MetaData->getGroups('')\n#10 \/var\/www\/oldcloud\/settings\/users.php(68): OC\\Group\\MetaData->get()\n#11 \/var\/www\/oldcloud\/lib\/private\/route\/route.php(154) : runtime-created function(1): require_once('\/var\/www\/oldclo...')\n#12 [internal function]: __lambda_func(Array)\n#13 \/var\/www\/oldcloud\/lib\/private\/route\/router.php(276): call_user_func('\\x00lambda_125', Array)\n#14 \/var\/www\/oldcloud\/lib\/base.php(907): OC\\Route\\Router->match('\/settings\/users')\n#15 \/var\/www\/oldcloud\/index.php(39): OC::handleRequest()\n#16 {main}","File":"\/var\/www\/oldcloud\/apps\/user_ldap\/lib\/ldap.php","Line":287}Integrity status for oC9+
Login as admin user into your ownCloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.No errors have been found.