asreg: estimate regression by year and sector in Stata

Dear Shah, I'm an accounting Ph.D. student and write a tutorial paper now. I often have to estimate regressions by year and by sector. In this article that I am working on now, this is also necessary. The way I did it was by using the "if" subcommands. But I found your package when I was reviewing it. When I try to estimate my regression by command:

bys Firm_id Year : asreg TA_jones1991 InverseAT_jones1991 delta_Revenue_jones1991 PPE_jones1991

The columns generated in my database are all like n.a. The database is available in this link: Can you help me when I may be wrong? All the best.