Grok Pattern not parsing

Thank you very much!

this is what I got:

{
"message" => "2016-05-09 12:00:00,029 DEBUG [com.googlecode.genericdao.search.BaseSearchProcessor] (MVCScheduler_Worker-1) generateQL:",
"@version" => "1",
"@timestamp" => "2016-05-11T12:40:49.362Z",
"path" => "/home/dlopez/server_test.log",
"host" => "sgl-v6-hce-piraeusbank-back",
"tags" => [
[0] "_grokparsefailure"
]
}

My parser is not working fine but I don't know why

Thanks