**50**wrote:

Hi All,

I did and ATAC-Seq experiment in different cell lines and I was curious to see if they have different motifs in the open chromatin. I was planning to use HOMER for this, but running from linux bash:

findMotifsGenome.pl ATAC_d001_peaks_called_with_homer.txt hg38 ATACAd001_FIND_MOTIF

I got this message of error (see below), it looks like the problem is in assignGeneWeights.pl line 63. Any tips on how to fix it? Position file = ATAC_d001_peaks_called_with_homer.txt Genome = hg38 Output Directory = ATACAd001_FIND_MOTIF Fragment size set to 400 Found mset for "human", will check against vertebrates motifs Peak/BED file conversion summary: BED/Header formatted lines: 0 peakfile formatted lines: 42719

```
Peak File Statistics:
Total Peaks: 42719
Redundant Peak IDs: 0
Peaks lacking information: 0 (need at least 5 columns per peak)
Peaks with misformatted coordinates: 0 (should be integer)
Peaks with misformatted strand: 0 (should be either +/- or 0/1)
Peak file looks good!
Background files for 400 bp fragments found.
Extracting sequences from file: /home/l..
Looking for peak sequences in a single file (/home/ls760/r...nome.fa)
Not removing redundant sequences
Sequences processed:
0 total
Frequency Bins: 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.6 0.7 0.8
Freq Bin Count
Total sequences set to 50000
Choosing background that matches in CpG/GC content...
```

Illegal division by zero at /home..mer/bin/assignGeneWeights.pl line 63. Assembling sequence file... Normalizing lower order oligos using homer2

```
Reading input files...
0 total sequences read
Autonormalization: 1-mers (4 total)
A inf% inf% -nan
C inf% inf% -nan
G inf% inf% -nan
T inf% inf% -nan
Autonormalization: 2-mers (16 total)
AA inf% inf% -nan
CA inf% inf% -nan
GA inf% inf% -nan
TA inf% inf% -nan
AC inf% inf% -nan
CC inf% inf% -nan
GC inf% inf% -nan
TC inf% inf% -nan
AG inf% inf% -nan
CG inf% inf% -nan
GG inf% inf% -nan
TG inf% inf% -nan
AT inf% inf% -nan
CT inf% inf% -nan
GT inf% inf% -nan
TT inf% inf% -nan
Autonormalization: 3-mers (64 total)
Normalization weights can be found in file: ATACAd001_FIND_MOTIF/seq.autonorm.tsv
Converging on autonormalization solution:
...............................................................................
Final normalization: Autonormalization: 1-mers (4 total)
A inf% inf% -nan
C inf% inf% -nan
G inf% inf% -nan
T inf% inf% -nan
Autonormalization: 2-mers (16 total)
AA inf% inf% -nan
CA inf% inf% -nan
GA inf% inf% -nan
TA inf% inf% -nan
AC inf% inf% -nan
CC inf% inf% -nan
GC inf% inf% -nan
TC inf% inf% -nan
AG inf% inf% -nan
CG inf% inf% -nan
GG inf% inf% -nan
TG inf% inf% -nan
AT inf% inf% -nan
CT inf% inf% -nan
GT inf% inf% -nan
TT inf% inf% -nan
Autonormalization: 3-mers (64 total)
Finished preparing sequence/group files
----------------------------------------------------------
Known motif enrichment
Reading input files...
0 total sequences read
414 motifs loaded
Cache length = 11180
Using binomial scoring
Checking enrichment of 414 motif(s)
|0% 50% 100%|
=================================================================================
```

Illegal division by zero at /home/l...3/homer/bin/findKnownMotifs.pl line 152. ---------------------------------------------------------- De novo motif finding (HOMER)

```
Scanning input files...
```

!!! Something is wrong... are you sure you chose the right length for motif finding? !!! i.e. also check your sequence file!!!

```
Scanning input files...
```

!!! Something is wrong... are you sure you chose the right length for motif finding? !!! i.e. also check your sequence file!!!

```
-blen automatically set to 2
Scanning input files...
```

!!! Something is wrong... are you sure you chose the right length for motif finding? !!! i.e. also check your sequence file!!! Use of uninitialized value in numeric gt (>) at /home.../homer/bin/compareMotifs.pl line 1389. !!! Filtered out all motifs!!! Job finished - if results look good, please send beer to ..

```
Cleaning up tmp files...
```