Ant exec resultproperty is not working

I am calling a batch file using an Ant exec task and setting the result in resultpropery. But the return value never comes to Ant. Below is my code

<property name="BuildErrorCode" value="abc"/>
<exec executable="cmd" resultproperty="BuildErrorCode" failonerror="false"
      dir="C:\workspace\build\">
    <arg value="/c"/>
    <arg value="cmake_cross_compile.bat"/>
</exec>

<echo message="Error Code:=${BuildErrorCode}" />

I exit my batch script by:

if %errorlevel% neq 0 exit /b %errorlevel%

When the script runs, i always get abc as value instead of return value from batch file. My batch file returns 2 for now and I have to stop the build

I want to do the following:

1. If the return value is <> 0 then i have to make the build fail which is not happening now.

Any idea how I can get he return value and make the ant build fail?