Dear Rob,
Thanks for your interest in IQ-Tree.
Just from the error message, I would say that 48718 is larger than your actual alignment length.
However, this is guessing, because I cannot check your alignment ;)
Best regards,
Heiko
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Heiko Schmidt
Center for Integrative Bioinformatics Vienna (CIBIV)
University of Vienna / Max F. Perutz Laboratories (MFPL)
http://www.cibiv.at/
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