This is just a minor problem that most of people won't encounter if they set up the "sample_info" argument as a data.frame instance. 

By reading the man page of analyzeFeatures, I thought "sample_info" argument could be either data.frame or DataFrame. And the fact is it could be either, but have different constraint. If I let sample_info to be DataFrame, then the rownames must be either NULL or the same as "sample_name" column. Otherwise,  an error occurs when generatitng the SummarizedExperiemnt for the feature counts.  On the other hand, if sample_info is a data.frame, it wouldn't cause any problem whatever its rownames are. The reason is the internal function would convert the data.frame to DataFrame and the rownames would automatically set to  NULL.  Below is the reproducible example.  

library(SGSeq)
path <- system.file("extdata", package = "SGSeq")
si$file_bam <- file.path(path, "bams", si$file_bam)
rownames(si)
si <- DataFrame(si)
rownames(si)
rownames(si) <- 1:nrow(si)
sgfc <- analyzeFeatures(si[1,], gr)


Predict features...
N1 complete.
Process features...
Obtain counts...
N1 complete.
Error in FUN(X[[i]], ...) :
  assay colnames() must be NULL or equal colData rownames()

I encountered this problem because I made "sample_info" as a DataFrame and use it for other purpose. I know it could be fix if I just convert it to data.frame when using the SESeq package. But it is kind of funny, right?

SessionInfo()

> sessionInfo()
R Under development (unstable) (2016-02-27 r70236)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 14.04.3 LTS

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] stats4    parallel  stats     graphics  grDevices utils     datasets
[8] methods   base

other attached packages:
[1] SGSeq_1.5.5                 SummarizedExperiment_1.1.18
[3] Biobase_2.31.3              GenomicRanges_1.23.13
[5] GenomeInfoDb_1.7.6          IRanges_2.5.24
[7] S4Vectors_0.9.27            BiocGenerics_0.17.3
[9] BiocInstaller_1.21.3

loaded via a namespace (and not attached):
 [1] igraph_1.0.1             AnnotationDbi_1.33.7     XVector_0.11.4
 [4] magrittr_1.5             zlibbioc_1.17.0          GenomicAlignments_1.7.13
 [7] BiocParallel_1.5.16      tools_3.3.0              DBI_0.3.1
[10] rtracklayer_1.31.6       bitops_1.0-6             RUnit_0.4.31
[13] RCurl_1.95-4.7           biomaRt_2.27.2           RSQLite_1.0.0
[16] GenomicFeatures_1.23.22  Biostrings_2.39.7        Rsamtools_1.23.3
[19] XML_3.98-1.3
>

Thanks for reporting. Looks like this is caused by changes in the SummarizedExperiment package in bioc-devel. This is fixed in SGSeq 1.5.8 - available via svn now or biocLite() tomorrow.

Leonard