Script to fit clips in different tracks.

[Вятка31797836ulow]

Good afternoon. The bottom line is that you need to automatically adjust the beginning of the second clip in the second track to the beginning of the third from the end of the clip in the first track in the active sequence. And the script is even executed in the environment itself, but stops at the line and does not go any further. Tell me what is the reason? Where is the mistake? Thank you

[Вятка31797836ulow]

var project = app.project;
var sequence = project.activeSequence;

var videoTrack_1 = sequence.videoTracks[0]; // первая видеодорожка с основными клипами
var videoTrack_3 = sequence.videoTracks[2]; // третья видеодорожка с сердечками

var numVideoClips_1 = videoTrack_1.clips.numItems; //количество клипов в первой видеодорожке

videoTrack_3.clips[1].start = videoTrack_1.clips[(numVideoClips_1)-3].start;
videoTrack_3.clips[1].end.ticks = videoTrack_1.clips[(numVideoClips_1)-3].end.ticks;
videoTrack_3.clips[0].end.ticks = videoTrack_1.clips[(numVideoClips_1)-5].end.ticks;