java.lang.NumberFormatException: For input string: "${builds.count}"

We have migrated from TC 7.x to 8.1.1 and facing some issues with REST API:

The below query  with TC 7.x

http://${tc.server.ip}/httpAuth/app/rest/buildTypes/id:@{build.id}/builds?locator=running:true

Gave this output:

<builds count=0>

Same query with 8.1 is giving the below output:

<builds href="/ttpAuth/app/rest/buildTypes/id:@{build.id}/builds?locator=running:true"/>

Has anything changed with the REST APIs now. How could we get them working now.

Hello, you can provide exact REST API version in request to use the old behaviour: http://confluence.jetbrains.com/display/TCD8/REST+API#RESTAPI-RESTAPIVersions.

In your case it would be http://${tc.server.ip}/httpAuth/app/rest/7.0/buildTypes/id:@{build.id}/builds?locator=running:true