This time we’re going bigger than ever. Fabric, Power BI, SQL, AI and more. We're covering it all. You won't want to miss it.
Learn moreDid you hear? There's a new SQL AI Developer certification (DP-800). Start preparing now and be one of the first to get certified. Register now
when i try to refresh data or create a new dashboard
Expression.Error: Valur "Preferred" is not on of the correct type.
i did a test with a mysql database with only one simple table and I saw the same message error
Solved! Go to Solution.
Dear Ross73312, thanks a lot.
After playing and reviewing everything, I uninstalled the odbc connector from mysql and also uninstalled the powerbi desktop. Install everything from scratch on my laptop and it was fixed.
If i had to guess, i'm expecting your Preferred column is either of type Date or Number. You might have a step that is trying to set this column as a type such as that. In your new data, some value is appearing that is not of that type. For example if you was numbers, you might have a value that contains a dash, or a blank.
Dear Ross73312, thanks a lot.
After playing and reviewing everything, I uninstalled the odbc connector from mysql and also uninstalled the powerbi desktop. Install everything from scratch on my laptop and it was fixed.
Hello! I have also the same problem! Did you change anything in your database? You had errors in data types? I am still trying to figure out what's going on. I uninstalled and installed Power BI and ODBC Connector but nothing has changed!
Check out the April 2026 Power BI update to learn about new features.
Sign up to receive a private message when registration opens and key events begin.
If you have recently started exploring Fabric, we'd love to hear how it's going. Your feedback can help with product improvements.
| User | Count |
|---|---|
| 37 | |
| 32 | |
| 26 | |
| 24 | |
| 17 |
| User | Count |
|---|---|
| 69 | |
| 50 | |
| 31 | |
| 25 | |
| 24 |