rule based upload successful but having fastqc error

I am new to RNA Seq and Galaxy platform. I uploaded a collection to galaxy australia using rule based uploader. The upload was successful but when I wanted to run Fastqc, I started having following error multiple times:
Failed to process DSCT3.gz
java.util.zip.ZipException: Not in GZIP format
at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:165)
at java.util.zip.GZIPInputStream.(GZIPInputStream.java:79)
at java.util.zip.GZIPInputStream.(GZ

Any help ?