Your error is one that the tool Get Data: EBI SRA was producing - now resolved.
For any reading:
If you were using either the EBI SRA or NCBI SRA tools before at http://usegalaxy.org and had problems, both of these tools are now functional due to updates in response to recent changes at the EBI and NCBI data repositories.
If working at another Galaxy server, make sure the latest version of the NCBI tool suite is installed. The EBI tool does not require a tool version update.