doublearea.cpp failed

[JZ-Z-Z]

Hi, i try to follow the instructions and play with the bunny, but ./introduction failed in doublearea.cpp.
"""
Assertion failed: F.cols() == 3, file F:\geometry-processing-introduction\libigl\include\igl\doublearea.cpp, line 27
"""
Here is the code that failed for reference
"""
// Only support triangles
assert(F.cols() == 3);
"""

[psarahdactyl]

Hi, which code calls the doublearea function? How are you calling it?