The .bdc file used as input to the tool does not have a valid JSON format.
Open the .bdc file using a text editor and verify that the JSON format is correct. Typically, an invalid .bdc file is created when you manually edit it. Verify you have correctly formatted the .bdc file by reviewing the topics on big data connection file formatting. Additionally, open the .bdc file and copy the contents into an online JSON validator. Sometimes a missing comma or bracket can cause the error.