hi everyone,
I'm working on a beat and I came across an error like this :
2017/08/08 07:46:39.505926 beat.go:267: INFO Home path: [/home/hp/src/github.com/bob96/hc34] Config path: [/home/hp/src/github.com/bob96/hc34] Data path: [/home/hp/src/github.com/bob96/hc34/data] Logs path: [/home/hp/src/github.com/bob96/hc34/logs]
2017/08/08 07:46:39.505957 beat.go:177: INFO Setup Beat: hc34; Version: 5.1.3
2017/08/08 07:46:39.506040 logp.go:219: INFO Metrics logging every 30s
2017/08/08 07:46:39.506086 output.go:167: INFO Loading template enabled. Reading template file: /home/hp/src/github.com/bob96/hc34/hc34.template.json
2017/08/08 07:46:39.506262 output.go:178: INFO Loading template enabled for Elasticsearch 2.x. Reading template file: /home/hp/src/github.com/bob96/hc34/hc34.template-es2x.json
2017/08/08 07:46:39.506655 client.go:120: INFO Elasticsearch url: http://localhost:9200
2017/08/08 07:46:39.506691 outputs.go:106: INFO Activated elasticsearch as output plugin.
2017/08/08 07:46:39.506756 publish.go:291: INFO Publisher name: hp-HP-Pavilion-15-Notebook-PC
2017/08/08 07:46:39.507171 async.go:63: INFO Flush Interval set to: 1s
2017/08/08 07:46:39.507188 async.go:64: INFO Max Bulk Size set to: 50
2017/08/08 07:46:39.507793 beat.go:207: INFO hc34 start running.
2017/08/08 07:46:39.507926 hc34.go:98: INFO hc34 is running! Hit CTRL-C to stop it.
2017/08/08 07:46:39.529717 hc34.go:174: INFO Event sent
2017/08/08 07:46:39.529741 hc34.go:107: INFO Event sent
2017/08/08 07:46:40.516641 client.go:652: INFO Connected to Elasticsearch version 5.5.0
2017/08/08 07:46:40.516666 output.go:214: INFO Trying to load template for client: http://localhost:9200
2017/08/08 07:46:40.518197 output.go:235: INFO Template already exists and will not be overwritten.
panic: interface conversion: interface {} is nil, not string
goroutine 39 [running]:
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch.eventBulkMeta(0xbfc600, 0xc42018e800, 0x0, 0xc42045ee40, 0x0, 0x0, 0x0)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch/client.go:317 +0x121
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch.bulkEncodePublishRequest(0x7f4e810a2440, 0xc4201980f8, 0xbfc600, 0xc42018e800, 0x0, 0xc4201a2380, 0x1, 0x32, 0xc42019a2f0, 0x147, ...)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch/client.go:290 +0xd6
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch.(*Client).PublishEvents(0xc4201be140, 0xc4201a2380, 0x1, 0x32, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch/client.go:235 +0x138
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single.(*Mode).PublishEvents.func1(0xc4201c6780)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single/single.go:89 +0x7b
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single.(*Mode).publish(0xc4201c6780, 0x0, 0x0, 0x7f4e8116de00, 0xc4201afb88, 0xc42046a000, 0x0)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single/single.go:144 +0x290
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single.(*Mode).PublishEvents(0xc4201c6780, 0x0, 0x0, 0x0, 0xc4201a2380, 0x1, 0x32, 0x1, 0x1)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/mode/single/single.go:99 +0x7d
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch.(*elasticsearchOutput).BulkPublish(0xc42019a280, 0x0, 0x0, 0x0, 0xc4201a2380, 0x1, 0x32, 0xc42003ffbe, 0xc42003ff28)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/outputs/elasticsearch/output.go:308 +0x79
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*outputWorker).sendBulk(0xc4201903c0, 0xc42003fd38, 0xc4201a2380, 0x1, 0x32)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/output.go:112 +0x123
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*outputWorker).onBulk(0xc4201903c0, 0xc42003fd38, 0xc4201a2380, 0x1, 0x32)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/output.go:88 +0x281
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*outputWorker).onMessage(0xc4201903c0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc4201a2380, 0x1, 0x32)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/output.go:70 +0x9a
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*messageWorker).onEvent(0xc4201903c0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc4201a2380, 0x1, 0x32)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/worker.go:83 +0x74
github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*messageWorker).run(0xc4201903c0)
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/worker.go:69 +0x290
created by github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher.(*messageWorker).init
/home/hp/src/github.com/bob96/hc34/vendor/github.com/elastic/beats/libbeat/publisher/worker.go:57 +0x107
can someone help me please
best regards!