Rest Assured – Schema to use cannot be null

I’m working with Java and REST Assured to test REST APIs. I was trying the example with JSON schema validation but it throws this error:

java.lang.IllegalArgumentException: Schema to use cannot be null

at io.restassured.module.jsv.JsonSchemaValidator.validateSchemaIsNotNull(JsonSchemaValidator.java:270)
at io.restassured.module.jsv.JsonSchemaValidator.access$300(JsonSchemaValidator.java:75)
at io.restassured.module.jsv.JsonSchemaValidator$JsonSchemaValidatorFactory.create(JsonSchemaValidator.java:281)
at io.restassured.module.jsv.JsonSchemaValidator.matchesJsonSchema(JsonSchemaValidator.java:166)
at io.restassured.module.jsv.JsonSchemaValidator.matchesJsonSchemaInClasspath(JsonSchemaValidator.java:117)
at suites.SchemaFollowupTest.ContractFollowUpTestSuccess(SchemaFollowupTest.java:44)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

My test code is:

given()
            .header("Content-Type", ContentType.JSON)
            //.header("Authorization", "Bearer " + ConfigEnvironments.TOKEN_K8S)
            .body(jsonBody)
            .when()
            .post(ConfigEnvironments.BASE_URL_CLAIMENGINE +"/api/v1/FollowUp")
            .then().log().all()
            .statusCode(202)
            .and()
            .body(matchesJsonSchemaInClasspath("src/test/resource/followup-schema.json"));

My strucuture folder is here:
[1]: https://i.sstatic.net/K9m2UjGy.png

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