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Why is the error happening? I did define the variables in the query.

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I defined *LatLng* in this way in the schema. It's a class from a different library that has *lat* and *lng* attributes. Is it the right way of defining the query variables?

seems weird. Is it because of radius is defined as int but you are providing a float?

But is my way of defining custom types and posting the objects correct?

If it's Double on the server, then you'll need to say it's Float when defining your query

on line 1 you have `$radius: Int`  which should be `$radius: Float`

Then it's probably something on the server?
How does your  `users`  resolver look?

it's because of the fields are non optional but in your query definition it says optional.
So to fix you should have this on line 1:
`query ($radius: Float!, $location: LatLng!) {`

if you tried to run the query you should have recieved this error: `Invalid variable $radius argument type Float, expected Float!`

in Kotlin fields are non-nullable by default, but in GraphQL fields are nullable by default.
so `Float`(in GraphQL) is the same as `Float?`(in Kotlin)
and `Float!`(in GraphQL) is the same as `Float` (in Kotlin)

Wow, thanks!! But strangely, the warning still shows

by the ktor plugin or some other online website?

Then it should work. I will try and reproduce this locally. wait a minute

I tested it locally and am not getting this

could you open up the browser console and say what errors are shown there?

I was asking the same earlier, if I am defining and sending the custom types properly. The error seems to be due to this, as I feared. But now can you help with this?

Not sure, as it's hard to really understand the issue here without seeing the full code.

This is basically the only code relevant, I believe

*LatLng* is this class: <https://developers.google.com/android/reference/com/google/android/gms/maps/model/LatLng>

I think I found the issue here :slightly_smiling_face:
<https://github.com/aPureBase/KGraphQL/blob/master/kgraphql/src/main/kotlin/com/apurebase/kgraphql/schema/execution/ArgumentTransformer.kt#L29>
As LatLng is a java class and does not have any primary constructor this line throws a null pointer exception

This is something that should work, so I will investigate further :thumbsup:

<https://github.com/aPureBase/KGraphQL/issues/106>