ERROR (0) - undefined

[nbrittain]

Hi,

I am attempting to run forna to view secondary structure from an RNA fasta. When I attempt to input the sequence I am met with the above error.

I don't have structural information in my fasta, but noted on the website:

Note that the secondary structure is not a necessary input. If one is not provided, the minimum free energy (MFE) structure will be calculated for the given sequence using RNAfold

So I was under the impression it isn't needed?

Many thanks for any help,

Nick