The line0 error shows up in MoI4 and MoI5 beta, when the figure8 elastica has been selected and the script re-ran, ( with z equivalent not zero.)
Sometimes this bug also occurs in Top View...With z = 0.
MoI3 shows a different looking similar error, in the .js file.- perhaps more useful.
MoI3 also shows the bug with mirror2 at strange angle.
- Brian