Slack integration not working

Hi I need help!! Installed and configured graylog server successfully, I am trying to set slack notification using the plugin https://github.com/graylog-labs/graylog-plugin-slack,
But after configuring when I hit test I get 500. Here are the console log

client.js:802 POST http://example.gralog.org/api/alerts/callbacks/5a27efd37d3c06654a23430c/test 500 (Internal Server Error)
u._end @ client.js:802
u.end @ client.js:706
(anonymous) @ index.js:80
s @ bluebird.js:989
o._resolveFromExecutor @ bluebird.js:3246
o @ bluebird.js:2842
i.promise @ index.js:79
i.then @ index.js:121
value @ FetchProvider.js:57
(anonymous) @ FetchProvider.js:153
a @ FetchProvider.js:154
testAlert @ AlertNotificationsStore.js:61
_onTestNotification @ AlertNotification.jsx?7cee***:33
r.invokeGuardedCallback @ vendor.ab8f49e0e782eae99198.js:20
i @ vendor.ab8f49e0e782eae99198.js:20
s @ vendor.ab8f49e0e782eae99198.js:20
f @ vendor.ab8f49e0e782eae99198.js:6
m @ vendor.ab8f49e0e782eae99198.js:6
n @ vendor.ab8f49e0e782eae99198.js:20
processEventQueue @ vendor.ab8f49e0e782eae99198.js:6
n @ vendor.ab8f49e0e782eae99198.js:20
handleTopLevel @ vendor.ab8f49e0e782eae99198.js:20
a @ vendor.ab8f49e0e782eae99198.js:20
r @ vendor.ab8f49e0e782eae99198.js:20
perform @ vendor.ab8f49e0e782eae99198.js:6
batchedUpdates @ vendor.ab8f49e0e782eae99198.js:20
a @ vendor.ab8f49e0e782eae99198.js:6
dispatchEvent @ vendor.ab8f49e0e782eae99198.js:20
FetchProvider.js:17 There was an error fetching a resource: cannot POST http://example.gralog.org/api/alerts/callbacks/5a27efd37d3c06654a23430c/test (500). Additional information: Could not send message to Slack.
t @ FetchProvider.js:17
(anonymous) @ FetchProvider.js:82
i @ bluebird.js:5253
o._settlePromiseFromHandler @ bluebird.js:3275
o._settlePromise @ bluebird.js:3332
o._settlePromise0 @ bluebird.js:3377
o._settlePromises @ bluebird.js:3452
(anonymous) @ bluebird.js:175
Promise resolved (async)
o @ bluebird.js:4481
c.hasDevTools.r.settlePromises @ bluebird.js:174
o._reject @ bluebird.js:3419
o._rejectCallback @ bluebird.js:3237
(anonymous) @ bluebird.js:3249
(anonymous) @ index.js:93
u.callback @ client.js:615
(anonymous) @ client.js:434
n.emit @ index.js:133
t.onreadystatechange @ client.js:735
XMLHttpRequest.send (async)
u._end @ client.js:802
u.end @ client.js:706
(anonymous) @ index.js:80
s @ bluebird.js:989
o._resolveFromExecutor @ bluebird.js:3246
o @ bluebird.js:2842
i.promise @ index.js:79
i.then @ index.js:121
value @ FetchProvider.js:57
(anonymous) @ FetchProvider.js:153
a @ FetchProvider.js:154
testAlert @ AlertNotificationsStore.js:61
_onTestNotification @ AlertNotification.jsx?7cee***:33
r.invokeGuardedCallback @ vendor.ab8f49e0e782eae99198.js:20
i @ vendor.ab8f49e0e782eae99198.js:20
s @ vendor.ab8f49e0e782eae99198.js:20
f @ vendor.ab8f49e0e782eae99198.js:6
m @ vendor.ab8f49e0e782eae99198.js:6
n @ vendor.ab8f49e0e782eae99198.js:20
processEventQueue @ vendor.ab8f49e0e782eae99198.js:6
n @ vendor.ab8f49e0e782eae99198.js:20
handleTopLevel @ vendor.ab8f49e0e782eae99198.js:20
a @ vendor.ab8f49e0e782eae99198.js:20
r @ vendor.ab8f49e0e782eae99198.js:20
perform @ vendor.ab8f49e0e782eae99198.js:6
batchedUpdates @ vendor.ab8f49e0e782eae99198.js:20
a @ vendor.ab8f49e0e782eae99198.js:6
dispatchEvent @ vendor.ab8f49e0e782eae99198.js:20
polyfill.e83b3dfb1898222fd83b.js:1 [Violation] 'message' handler took 150ms
bluebird.js:1542 Unhandled rejection Error: cannot POST http://example.gralog.org/api/alerts/callbacks/5a27efd37d3c06654a23430c/test (500)
    at new t (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:1:2373)
    at http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:1:3774
    at i (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:72992)
    at o._settlePromiseFromHandler (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:46314)
    at o._settlePromise (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:47114)
    at o._settlePromise0 (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:47813)
    at o._settlePromises (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:49029)
    at http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:2564
    at <anonymous>
From previous event:
    at o.p [as _captureStackTrace] (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:10310)
    at o._then (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:41761)
    at o.then (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:44:40117)
    at u.i.then (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:188:117230)
    at e.value (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:1:3317)
    at http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:1:1519
    at a (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:1:1536)
    at s.testAlert (http://example.gralog.org/assets/plugin/org.graylog.plugins.pipelineprocessor.ProcessorPlugin/plugin.org.graylog.plugins.pipelineprocessor.PipelineProcessorPlugin.54b3d0ec48cf21479ac0.js:104:1060610)
    at t._onTestNotification (http://example.gralog.org/assets/36.e83b3dfb1898222fd83b.js:1:3134)
    at Object.r.invokeGuardedCallback (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:182385)
    at i (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:247314)
    at Object.s [as executeDispatchesInOrder] (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:247561)
    at f (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:6:34841)
    at m (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:6:34967)
    at Array.forEach (<anonymous>)
    at n (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:190321)
    at Object.processEventQueue (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:6:36254)
    at n (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:292354)
    at Object.handleTopLevel [as _handleTopLevel] (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:292426)
    at a (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:292902)
    at r (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:292716)
    at n.perform (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:6:43664)
    at Object.batchedUpdates (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:176189)
    at Object.a [as batchedUpdates] (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:6:15582)
    at dispatchEvent (http://example.gralog.org/assets/vendor.ab8f49e0e782eae99198.js:20:293785)

greylogserver version: Graylog 2.3.2
Plugin: version # 3.0.0

There is nothing in graylog server logs .

Please help

Please open a bug report at https://github.com/graylog-labs/graylog-plugin-slack/issues and include as much information as possible, such as the configuration of the Slack alarm callback you’re using, the logs of your Graylog node(s), and the contents of the JavaScript console of your browser.

Ok thank you for quick reply.

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