failed to read FASTA file

[wolfylair]

Hi,

I uploaded my fasta file in order to calculate GC content. But DensityMap could not find where it is since an error popped out:

`Use of uninitialized value in numeric gt (>) at
/group/pawsey0263/yguo/Anaconda3/bin/DensityMap.pl line 171 (#1)
(W uninitialized) An undefined value was used as if it were already
defined. It was interpreted as a "" or a 0, but maybe it was a mistake.
To suppress this warning assign a defined value to your variables.

To help you figure out what was undefined, perl will try to tell you
the name of the variable (if any) that was undefined.  In some cases
it cannot do this, so it also tells you what operation you used the
undefined value in.  Note, however, that perl optimizes your program
and the operation displayed in the warning may not necessarily appear
literally in your program.  For example, "that $foo" is usually
optimized into "that " . $foo, and the warning will refer to the
concatenation (.) operator, even though there is no . in
your program.`

I followed the format as instructed in the dmel example. Could you please help me solve this issue?

Regards