UVAtlas Internal error: Closed surface not correctly partitioned

[wsyOverflow]

lod_0_new_cluster_size_2014_cluster_609_e3.zip

I try to unwrap above mesh of obj format in visual studio project of UVAtlas. I config the debugging command arguments "-ft obj -t -y "\path\to\obj"", but failed to unwrap uv by error "UVAtlas Internal error: Closed surface not correctly partitioned".

Is there any fallback for this issue? Thanks