ValueError: IntervalTree: Null Interval objects not allowed in IntervalTree

[robertwhbaldwin]

a list of tuples:
[(1234, 4)]

def calc_aln_length( aln_intervals: list[tuple] ) -> int:
itree = IntervalTree.from_tuples(aln_intervals)

produces this error:
ValueError: IntervalTree: Null Interval objects not allowed in IntervalTree: Interval(1234, 4)

What is the problem ? This is not the expected behavior

[robertwhbaldwin]

nevermind it turns out that the begin and end coords were mixed up as you can see it should have been [(2, 1234)]