Error about regionreport HOT 4 CLOSED

dds = DESeqDataSetFromMatrix(countData = counts_table, colData = samples_anno, design = ~ group)
dds = dds[rowSums(counts(dds)) > 1, ]
dds = DESeq(object = dds)
dds_res = results(dds, contrast = c("group", "Group1", "Group2"))
dds_res = dds_res[order(dds_res$padj), ]
suppressWarnings(DESeq2Report(dds, project = project, intgroup = "sampleLabel", res = dds_res, output = label, outdir = out_dir))


> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.5 LTS

Matrix products: default
BLAS: /usr/lib/libblas/libblas.so.3.6.0
LAPACK: /usr/lib/lapack/liblapack.so.3.6.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.5.1

$ ping crossref.org
PING crossref.org (88.198.200.74) 56(84) bytes of data.
64 bytes from static.88-198-200-74.clients.your-server.de (88.198.200.74): icmp_seq=1 ttl=48 time=181 ms
64 bytes from static.88-198-200-74.clients.your-server.de (88.198.200.74): icmp_seq=2 ttl=48 time=178 ms
64 bytes from static.88-198-200-74.clients.your-server.de (88.198.200.74): icmp_seq=3 ttl=48 time=178 ms
^C
--- crossref.org ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 178.231/179.348/181.362/1.508 ms

$ ping data.crossref.org
PING data.crossref.org (208.254.38.85) 56(84) bytes of data.
^C
--- data.crossref.org ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4100ms