We were able to observe the issue but we need to look into it more. We have logged the issue in our database for investigation and for a fix. Once, we will have some news for you, we will update you in this topic.
This issue has been logged as
CELLSJAVA-42690 - Error converting XLSX to HTML
For the error: “java.lang.Exception: invalid image stream or image format is not supported.” It is occurring because there are some images which are not supported by Java’s default image APIs. To solve this issue, please use JAI libraries: add the JAI libraries(jai_core.jar and jai_imageio.jar) into the classpath and then the process should succeed. Please let us know your feedback.
how to do this?
You can download JAI libraries from below link or you can download them from Maven repository.
OK ,it works well!
Good to know that your issue is sorted out. Feel free to contact us any time if you need further help or have some other issue or queries, we will be happy to assist you soon.