Power BI file failing to open

[manoj_0911]

Hi ,

I have a Power BI file that is failing to open both in Desktop (July 2025 release) and in the Service.

Error logs show the following:

TypeError: Cannot read properties of undefined (reading 'report')
at Object.v [as parseThemeObjects]...

From what I checked, the issue seems related to the report theme JSON. 

I tried resetting the theme to default in Desktop, but the issue still persists.

👉 Has anyone faced a similar issue ?
👉 Is there a way to remove/reset?

Thanks in advance,
Manoj

[v-priyankata]

Hi @manoj_0911 

Thank you for reaching out to the Microsoft Fabric Forum Community.

@FBergamaschi @collinq Thanks for the inputs.

The suggestions provided by the user are helpful. In addition to their points, please consider the following basic suggestions.

1.  If possible, can you please try opening the file in an earlier version of Power BI Desktop. Sometimes, newer releases might introduce changes that aren't backward compatible.
2. ⁠Go to file>options>data load>clear cache

If I misunderstand your needs or you still have problems on it, please feel free to let us know.  

Thanks.

[v-priyankata]

Hi @manoj_0911 

Thank you for reaching out to the Microsoft Fabric Forum Community.

I hope the information provided was helpful. If you still have questions, please don't hesitate to reach out to the community.

[v-priyankata]

Hi @manoj_0911 

I wanted to check if you had the opportunity to review the information provided. Please feel free to contact us if you have any further questions.

[collinq]

Hi @manoj_0911 ,

Are you using Json?  This is an error that sometimes points to a json that is improperly formatted (like perhaps the theme???)  

[FBergamaschi]

I would suggest to open a ticket to Microsoft from the Power Platform admin page

https://admin.powerplatform.microsoft.com/

If this helped, please consider giving kudos and mark as a solution

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Francesco Bergamaschi

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