You need to install the package on your computer.
For example, if you get the following error:ImportError: No module named pandas
conda install pandas
TVB expecting to read a tract_lengths.txt file when loading connectivity.
Under the zip file (e.g. CON01T1_TVB), create a file named tract_length.txt and compress the zip file to replace the original one.
If you have a troubleshooting issue that is not listed here, obtain free support for TVB through the TVB Users Group.
Email to: tvb-users@googlegroups.com