NoSuchFieldError on signing

[GauravKamble09]

Hello,
I am using version 2.2.14 of JSON schema validator. We are using a schema file to validate. Following is the code for the same.

File tempFile;
try{
InputStream inputStream = mContext.getResources().openRawResource(R.raw.schemafile);
tempFile = File.createTempFile("pre", "suf");
copyFile(inputStream, new FileOutputStream(tempFile));
} catch (IOException e) {
throw new RuntimeException("Can't create temp file ", e);
}

JsonNode schemaNode = JsonLoader.fromFile(tempFile);
JsonNode inputNode = JsonLoader.fromString(inputJSON);
JsonSchemaFactory factory = JsonSchemaFactory.byDefault();
JsonSchema schema = factory.getJsonSchema(schemaNode);
report = schema.validate(inputNode);

But after signing the build, I am getting following error:
java.lang.NoSuchFieldError: No static field PUBLIC_ONLY of type Lmyobfuscatedapp/gj/h; in class Lmyobfuscatedapp/gj/h; or its superclasses (declaration of 'myobfuscatedapp.gj.h' appears in /data/app/blancco.sdkadoptionsampleapp-AZYRsc6ne-ND0EKSp9m7vw==/base.apk!classes2.dex)
at java.lang.Class.getDeclaredAnnotation(Native Method)
at java.lang.Class.getAnnotation(Class.java:2493)
at com.fasterxml.jackson.databind.introspect.VisibilityChecker$Std.(Unknown Source:6)
at com.fasterxml.jackson.databind.introspect.VisibilityChecker$Std.defaultInstance(Unknown Source:0)
at com.fasterxml.jackson.databind.ObjectMapper.(Unknown Source:19)
at com.github.fge.jackson.JacksonUtils.newMapper(Unknown Source:0)
at com.github.fge.jackson.JacksonUtils.(Unknown Source:4)
at com.github.fge.jackson.JacksonUtils.newMapper(Unknown Source:0)
at com.github.fge.jackson.JsonNodeReader.(Unknown Source:0)
at com.github.fge.jackson.JsonLoader.(Unknown Source:10)
at com.github.fge.jackson.JsonLoader.fromString(Unknown Source:0)
at myobfuscatedapp.gg.a.l(Unknown Source:113)
at com.diagnosticssdk.communicator.f.a(Unknown Source:29)
at com.diagnosticssdk.DiagnosticsSDK.b(Unknown Source:133)
at com.diagnosticssdk.DiagnosticsSDK.a(Unknown Source:65)
at blancco.sdkadoptionsampleapp.TestExecutionActivity.s(Unknown Source:300)
at blancco.sdkadoptionsampleapp.ay.onClick(Unknown Source:22)
at android.view.View.performClick(View.java:7862)
at android.widget.TextView.performClick(TextView.java:15004)
at android.view.View.performClickInternal(View.java:7831)
at android.view.View.access$3600(View.java:879)
at android.view.View$PerformClick.run(View.java:29359)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:8167)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

What is needed to add in pro guard file for handling this error? This code is working fine in debug build.