[galaxy-dev] Tophat2, Bowtie2 and Bowtie returns empty file

Tophat2, Tophat, Bowtie2 returns the empty file. The output is in the format: *Galaxy5-[Bowtie2_on_data_4__mapped_reads]* Whenever I open it by double clicking I get the empty file which 0 bytes file size. I am using hg19 index. What might be the problem?