Getting Error while trying to initiate Logic App Trigger - azure

Question

I am trying to configure a Logic App using Event Grid Trigger. The Trigger should be when my Azure CMK in my key vault is nearing expiry it should send me an email. I have configured the Logic App using the Logic App Designer, but when i try to run the trigger, it throws me the error as shown in the screenshot.
The screenshot for my designer is also attached. Any idea what do i need to do to fix this[![enter image description here][3]][3]
Also putting the code here for reference.
{
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"actions": {
"Send_an_email_(V2)": {
"inputs": {
"body": {
"Body": "<p>Your CMK will expire in 30 days</p>",
"ReplyTo": "myemailaddress ",
"Subject": "Key Expiry",
"To": "myemailaddress"
},
"host": {
"connection": {
"name": "#parameters('$connections')['outlook']['connectionId']"
}
},
"method": "post",
"path": "/v2/Mail"
},
"runAfter": {},
"type": "ApiConnection"
}
},
"contentVersion": "1.0.0.0",
"outputs": {},
"parameters": {
"$connections": {
"defaultValue": {},
"type": "Object"
}
},
"triggers": {
"When_a_resource_event_occurs": {
"inputs": {
"body": {
"properties": {
"destination": {
"endpointType": "webhook",
"properties": {
"endpointUrl": "#{listCallbackUrl()}"
}
},
"filter": {
"includedEventTypes": [
"Microsoft.KeyVault.KeyNearExpiry"
]
},
"topic": "/subscriptions/<subscriptionid>/resourceGroups/pallabdev/providers/Microsoft.KeyVault/vaults/testhalvault"
}
},
"host": {
"connection": {
"name": "#parameters('$connections')['azureeventgrid_1']['connectionId']"
}
},
"path": "/subscriptions/#{encodeURIComponent('subscriptionId')}/providers/#{encodeURIComponent('Microsoft.KeyVault.vaults')}/resource/eventSubscriptions",
"queries": {
"x-ms-api-version": "2017-06-15-preview"
}
},
"splitOn": "#triggerBody()",
"type": "ApiConnectionWebhook"
}
}
},
"parameters": {
"$connections": {
"value": {
"azureeventgrid_1": {
"connectionId": "/subscriptions/<subscriptionId>/resourceGroups/PallabDev/providers/Microsoft.Web/connections/azureeventgrid",
"connectionName": "azureeventgrid",
"connectionProperties": {
"authentication": {
"type": "ManagedServiceIdentity"
}
},
"id": "/subscriptions/<subscriptionId>/providers/Microsoft.Web/locations/canadacentral/managedApis/azureeventgrid"
},
"outlook": {
"connectionId": "/subscriptions/<subscriptionId>/resourceGroups/PallabDev/providers/Microsoft.Web/connections/outlook",
"connectionName": "outlook",
"id": "/subscriptions/<subscriptionId>/providers/Microsoft.Web/locations/canadacentral/managedApis/outlook"
}
}
}
}
}

Answer 1

The reason is that the triggerbody is null, it needs to be an array, if it is null, it will cause your error.
According to the discussion in the comment area, turning off Split On can avoid this error.