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Hello.
Every time I have tried to refresh a power bi connected to Oracle this meggage has appeared: An error happened while reading data from the provider: 'Object reference not set to an instance of an object.'
I have the Version: 2.99.621.0 64-bit (November 2021).
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Did this issue happen under import mode or direct query mode?
If it happpened under direct query mode, simliar issue had been submited internal(ICM: 236628486) that you can try to use different ODAC client to check this issue.
Best Regards,
Community Support Team _ Yingjie Li