Join us at FabCon Atlanta from March 16 - 20, 2026, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM.
Register now!Vote for your favorite vizzies from the Power BI Dataviz World Championship submissions. Vote now!
I have a complex data flow with lots of steps and a very large data set of over 1 million records.
If I try to refresh the data flow, I get this error:
Error: DataFormat.Error: We couldn't convert to Number. <ccon>AV6YDBJsYJl4CHHKaSpDiHNpQ4ym0RIbuAa9Yt9ow0dQiNmMn11RfjtG8iDrsSjNJWGwjmXzfU1UvfdlwPYH1g==</ccon>. RootActivityId = 45773551-4f86-4709-b5a3-085e4a55072d.Param1 = DataFormat.Error: We couldn't convert to Number. <ccon>AV6YDBJsYJl4CHHKaSpDiHNpQ4ym0RIbuAa9Yt9ow0dQiNmMn11RfjtG8iDrsSjNJWGwjmXzfU1UvfdlwPYH1g==</ccon> Request ID: 7325f47b-5f61-f55d-a092-4a57dab751f6.
Is there any way to find the offending column/record?
Kind regards
Dirk
I have a complex data flow with lots of steps and a very large data set of over 1 million records.
Don't have lots of steps. That's not what dataflows are for.
There is no good diagnostics tool. You will have to remove steps one by one and see when the message goes away.
Vote for your favorite vizzies from the Power BI World Championship submissions!
If you love stickers, then you will definitely want to check out our Community Sticker Challenge!
Check out the January 2026 Power BI update to learn about new features.
| User | Count |
|---|---|
| 18 | |
| 10 | |
| 9 | |
| 8 | |
| 7 |
| User | Count |
|---|---|
| 47 | |
| 38 | |
| 36 | |
| 25 | |
| 20 |