ERROR: Tree file does not start with an opening-bracket '(' (line 1 column 1)

[Steve G]

Hello, I am trying to get bootstraps, gCF, and sCF on a concatenated/supermatrix tree using the command: 

iqtree2 -t <supermatrix> --gcf <concat_loci> -p <align_directory> --scf 100 --prefix final -B 1000 -T 4

This is running for a few hours before failing with a ERROR: Tree file does not start with an opening-bracket '(' (line 1 column 1)

Does anyone know what is causing this?

Thanks!!

[Bui Quang Minh]

We're now moving to Github discussions. We'll close down Google group
in the near future; it is not even recommended anymore by Google.

Please post your question here:
https://github.com/iqtree/iqtree2/discussions and choose the category
as "Q&A".

Thanks
Minh

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