Incorrect input string passed for font

Aspose.PDF Cloud Product Family
1 
        // Upload File
        $api->uploadFile(
            $remoteFileName,
            $sourceFile
        );
        $oldValue = mb_convert_encoding("今月ご利用額合計", 'UTF-8', 'auto');
        $newValue = mb_convert_encoding("Trissss", 'UTF-8', 'auto');
        
        try {
            $textReplace = new TextReplace([
                "old_value" => $oldValue,
                "new_value" => $newValue,
                "regex" => false
            ]);
        
            $textReplaceRequest = new TextReplaceListRequest([
                "text_replaces" => [$textReplace]
            ]);
    
            // Call the TextReplace API 
            // THIS IS WHERE THE ERROR OCCURS
            $response = $api->postDocumentTextReplace(
                $remoteFileName,
                $textReplaceRequest,
                null,   // Storage
                null    // Folder
            );

Error:
Incorrect input string passed for font HeiseiMin-W3-UniJIS-UCS2-H

2

@triremvn007
Please share your input document to reproduce the issue.