Batch is Empty (Response ) Getting error when trying to create profiles using Bulk Profile Update API v2

We are trying to create some test profiles in our environment, and  we are executing the following command for calling the Batch Update profile API v2      'http://OUR_CLIENT_ID.tt.omtrdc.net/m2/OUR_CLIENT_ID/v2/profile/batchUpdate'

The contents of the BATCH.txt file are like this:

batch=thirdPartyId,param1,param2

xxxxx,y,y

And we are getting this error:

<response>
    <success>false</success>
    <visitorId></visitorId>
    <message>Batch is empty</message>
</response>

Could you please help me to resolve this.

Thank You