The errors you are encountering ("Microsoft Mashup Engine 1 error," "OData version 3 and 4 error," and "Error 404 Not Found") typically indicate issues with the data source or the connectivity between Power BI and the data source. Here are some possible causes and solutions for each error:
Microsoft Mashup Engine 1 Error:
This error often occurs when there is a problem with the Power Query (M) code or the transformation steps in the Power Query Editor. Check the Power Query steps and ensure that there are no syntax errors or unsupported operations.
OData Version 3 and 4 Error:
This error indicates a compatibility issue with the OData version used by the data source. Power BI supports both OData v3 and v4, but some data sources may only support one version. Try changing the OData version in the data source connection settings to match the version supported by your data source.
Error 404 Not Found:
The "Error 404 Not Found" indicates that Power BI couldn't find the requested resource (e.g., file, folder, or data endpoint) at the specified URL. Verify that the URL you are using to connect to the data source is correct and that the resource you are trying to access exists.
General troubleshooting steps for connectivity issues:
Double-check the Data Source URL:
Verify that the URL you are providing is correct and points to the right location of your data source.
Check Firewall and Proxy Settings:
Ensure that there are no firewall or proxy settings blocking the connection to the data source. Work with your IT team to allow access if necessary.
Verify Data Source Accessibility:
Check if the data source is accessible from the machine where Power BI is running. Try accessing the data source directly through a web browser or other tools to ensure it is reachable.
Test Connection with Different Tools:
Attempt to connect to the data source using other OData clients or web-based tools to verify if the issue is specific to Power BI.
Clear Credentials and Reconnect:
In Power BI Desktop, go to "File" > "Options and Settings" > "Data Source Settings." Find the data source connection, select it, and click on "Clear Permissions." Then, try reconnecting to the data source and re-enter the required credentials.
Update Power BI:
Make sure you are using the latest version of Power BI Desktop to ensure compatibility with data source connectors.