Rattus norvegicus (Norway rat) genome assembly Rnor_7.0 (rn7)

Dear sir/ Madam,
The latest reference genome for rats is currently available. But it has been updated in galaxy. I downloaded and used for the mapping. But unfortunately, when I wanted to change my bedgraph to bigwig, I got errors that Build/database is unspecified. I could not continue my analysis. Could you please help me with that?
Could you please let me know If it is possible to add an effective reference genome for rats?
Thank you
Fereshteh