I'm trying to download some chip-seq datasets from NCBI Gene Expression Omnibus using fastq-dump command like

fastq-dump SRR499718.lite.sra 

and I got error message like below:

2016-09-27T16:33:36 fastq-dump.2.7 err: item not found while constructing within virtual database module - the path 'SRR499718.lite.sra' cannot be opened as database or table.

However, running the command like following

fastq-dump SRR499718

worked fine.

When checking the GEO or SRA websites, I couldn't find any files with extension .lite.sra. My questions are 1) what are the differences between SRR*.lite.sra file and SRR*.sra file? 2) where can I download files with the extension .lite.sra? 

Any suggestions will be highly appreciated.

By the way, the problem rose when I was practising the following chip-seq workflow: 

source("http://bioconductor.org/workflows.R")
workflowInstall("chipseqDB")

sra.numbers <- c("SRR499718", "SRR499719", "SRR499720", "SRR499721", 
    "SRR499734", "SRR499735", "SRR499736", "SRR499737", "SRR499738")
grouping <- c("proB-8113", "proB-8113", "proB-8108", "proB-8108", 
    "matureB-8059", "matureB-8059", "matureB-8059", "matureB-8059", "matureB-8086")
all.sra <- paste0(sra.numbers, ".lite.sra")
data.frame(SRA=all.sra, Condition=grouping)

for (sra in all.sra) {
    code <- system(paste("fastq-dump", sra))
    stopifnot(code==0L)
}

After the for loop, I got the same error message as shown above.

I think the lite.sra files have been phased out, so you need to do

for (sra in all.sra) {
    code <- system(paste("fastq-dump", sra.numbers))
    stopifnot(code==0L)
}

instead.