Your reference genome has description content. Remove that with the tool NormalizeFasta wrapping the sequence to 80 bases and truncating the title line at the first whitespace.

The job itself probably failed because the genome was not first added using a "fetch genome" DM. The format issue will come up later (with DMs or when the indexed genome is used with tools). Fix the format first before running any DMs.

So - start with these DMs, in this order, before running the Diamond DM:

• 1 data_manager_fetch_genome_dbkeys_all_fasta
• 2 data_manager_sam_fasta_index_builder
• 3 data_manager_picard_index_builder
• 4 (optinal but recommended) data_manager_twobit_builder
• 5 data_manager_diamond_database_builder
• 6 any other indexes you need

This is a pretty small genome, so I wouldn't expect the job to fail for a memory error if your Galaxy instance has at least 16 GB of memory available (the minimum recommended size). When executing tools later, be aware that some may require more memory. It depends on the tools and inputs. A general guideline is that same resources needed to run a tool line-command are needed when running the same tool within Galaxy.

Other issues could be present depending on your config (especially if a cluster is used to run jobs), but that is a different situation. If the "data_manager_fetch_genome_dbkeys_all_fasta" DM fails, then looking into memory and potential cluster issues would be needed (with an admin's help, unless you are doing the config yourself).