[syncfusion_flutter_pdfviewer] Filling unicode character in PDF viewer occur Invalid argument (The character is not supported by the font.) Error

[aungzwin10]

In syncfusion_flutter_pdfviewer version 25.1.35,

When filling unicode character in PDF viewer form filling, Invalid argument (The character is not supported by the font.) error is shown and cannot save the document.
Unicode character means all language unicode character(Not only Chinese).

See the example error screenshot below.

[sAw-hTet-nAing]

I facing the same issue with this problem. Please help.

[phyueimon162]

Any solution? Same to me.

[immankumarsync]

We have analyzed your query, and we are able to reproduce the reported issue and currently, we are investigating the root cause of this issue at the source level at our end.

[immankumarsync]

In the document, the font assigned for the text field is 'Helvetica'. Helvetica font doesn't support Unicode characters, hence on saving the document, 'The character is not supported by the font' exception occurs. This is an expected behavior.

[aungzwin10]

@immankumarsync What is your suggested font for unicode?

[immankumarsync]

@aungzwin10, Arial Unicode MS font supports most Unicode characters.

Please refer to the following on how to use custom font with syncfusion_flutter_pdf library.
PdfTrueTypeFont

[aungzwin10]

@immankumarsync Although I created a fillable form PDF with Arial Unicode MS font on Text field, the error still happen.
Please see screenshots below for your reference.

I will attach the PDF for you to test too.
Arial Unicode Form.pdf

[immankumarsync]

@aungzwin10, we are able to replicate the issue, that the font is not retrieved properly when using a custom font. Currently, we are analyzing the root cause of this issue, and we will update further details upon finding the root cause.

[sAw-hTet-nAing]

@immankumarsync Any Updates?Currently I'm facing a big trouble in my project with this error.