Validation Error (Error Code 422) while trying to POST Hyperledger Transaction on REST API using POSTMAN - rest

Question

I was trying to test Transactions via Playground, Composer-Rest-server and Finally POSTMAN.
The Transactions worked perfectly on Playground (Figure 1 and 2) and also on the Composer-Rest-Server (Figure 3 and 4). But then I tried the same using POSTMAN, for which I am getting an Error ( Status Code 422 )(Figure 5).
I'm using the basic-sample-network. And the Transaction just updates the value of the asset.
Figure 1 - Executing Sample Transaction On Playground
Figure 2 - Updated Value of Asset #3952
Figure 3 - Executing the Transaction on the composer Rest Server
Figure 4 - Updated Value of Asset #3952 after the Rest Server Transaction
Figure 5 - Error While Using POSTMAN
The Error
"error": {
"statusCode": 422,
"name": "ValidationError",
"message": "The `org_example_basic_SampleTransaction` instance is not valid. Details: `asset` can't be blank (value: undefined); `newValue` can't be blank (value: undefined).",
"details": {
"context": "org_example_basic_SampleTransaction",
"codes": {
"asset": [
"presence"
],
"newValue": [
"presence"
]
},
"messages": {
"asset": [
"can't be blank"
],
"newValue": [
"can't be blank"
]
}
},
"stack": "ValidationError: The `org_example_basic_SampleTransaction` instance is not valid. Details: `asset` can't be blank (value: undefined); `newValue` can't be blank (value: undefined).\n at ...
What is the reason for this Error and How can I solve it?

Answer 1

You have to post data in JSON format.