Need help with errors of refreshing dataset in the service

[Beau-Vintertun]

I have had trouble updating my data ever since I originally uploaded it to the service. I am pulling data from Marketo in their cloud. 

"There was an error when processing the data in the dataset", this one is the most difficult on for me to understand why this is happening. 

Any information on any of these errors is much appreciated, thank you. 

[v-caliao-msft]

Hi @Beau-Vintertun,

As you connected to Marketo, the first error might be related with the Connection API. Marketo has an API for each account.  When the limit is reached, you won't be able to load data into Power BI. Detailed information, please check the article below:
Marketo content pack for Power BI

Second error should be related with Power BI Personal gateway service. Please follow the error description to restart the machine which have gateway installed to check out.
Additionally, we could check Event Log regarding gateway events:
“There are several event logs that can provide information. The first two, Data Management Gateway and PowerBIGateway, are present if you are an admin on the machine.  If you are not an admin, and you are using the Personal Gateway, you will see the log entries within the Application log.
The Data Management Gateway and PowerBIGateway logs are present under Application and Services Logs.“
For more helpful information regarding troubleshooting Personal gateway, please check:
Troubleshooting Power BI Gateway - Personal.

Last error message should be related with Dataset data format or the data type. Or we may take a try to capture Http trace to help analyze it, with Fiddler.
Fiddler Web Debugger Tool
Upload the traces into OneDrive, then post the shared link here, we will help to take a look.

If any further assistance needed, please post back.

Regards,

Charlie Liao