Save annotation throwing Custom filter is not valid error

Product: Java SDK

Product Version: latest

Please give a brief summary of your issue: Save annotation throwing Custom filter is not valid error
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Please describe your issue and provide steps to reproduce it:
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Saving annotations to same PDF file is throwing Custom filter is not valid error. Below is the code I am using
PDFDoc doc = new PDFDoc(inputStream);

inputStream is the file data retrieved from external system. Please let me know how I can save/merge the annotations to same input PDF document using PDFTron java API

Please provide a link to a minimal sample where the issue is reproducible:

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Hello Mohan,

Thank you for contacting us about this. To get a better understanding of the issue, could you please provide us with a full sample code or project where the issue can be reproduced on?

In particular, we would require the code you are using to load the document into a filter, so that we can accurately replicate the issue.

Thank you in advance for the additional information.

I found a solution. Thanks