Unable to clone spark_vio_catkin

[Vikash-iitd]

Description:
Unable to clone from https://github.mit.edu/SPARK/spark_vio_catkin from Release v4.0.

Command:

# replace this line with the command(s) you used

Console output:

Authentication required.

Additional files:
Please attach all the files needed to reproduce the error.

Please give also the following information:

• KimeraVIO branch, tag or commit used
• GTSAM version used:
• OpenGV version used:
• OpenCV version used: type opencv_version
• Operating system and version (e.g. Ubuntu 16.04 or Windows 10):
• Did you change the source code? (yes / no):
  no