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Master Guide to Fixing 602XML Form Filler Errors The 602XML Form Filler is a critical tool for submitting official electronic forms, particularly to European government portals like Czech public administration systems (Software602). However, users frequently encounter frustrating validation, installation, or submission errors.

This comprehensive troubleshooting guide will help you resolve the most common 602XML Form Filler issues quickly. 1. “Failed to Validate Digital Signature” Error

This error occurs when the application cannot verify your electronic certificate or the server’s security credentials.

Update Root Certificates: Open your operating system’s certificate manager. Install the latest root certificates from your national certification authority (e.g., PostSignum, I.CA).

Check Certificate Validity: Ensure your personal signing certificate has not expired.

Run as Administrator: Right-click the Form Filler icon. Select Run as administrator to give the software permission to access the Windows Certificate Store.

2. “Form Structure is Invalid” or “Schema Validation Failed”

This means the XML layout of your form does not match the strict requirements of the receiving server.

Download a Fresh Template: Do not reuse old saved forms. Government portals update form schemas frequently. Download the absolute latest .zfo or .xml file from the official portal.

Clear App Cache: Go to Preferences inside the Form Filler menu and clear the temporary form cache.

Avoid Special Characters: Ensure text fields do not contain unsupported symbols, hidden formatting, or emojis copied from external text editors. 3. “Connection to Server Failed” / Network Errors

Form Filler cannot communicate with the government gateway to submit the data.

Configure Proxy Settings: If you are using a corporate network, go to Tools > Options > Connection in Form Filler. Manually enter your network’s proxy details.

Whitelist the Application: Add FormFiller.exe to your Windows Defender Firewall allowed list.

Disable VPN temporarily: Some government servers block traffic originating from foreign or commercial VPN IP addresses. 4. Installation and Compatibility Crashing

The software fails to open, freezes mid-form, or crashes upon startup.

Enable Compatibility Mode: Right-click the application shortcut, go to Properties > Compatibility, and set it to run in compatibility mode for Windows 10 (or your respective operating system).

Reinstall 602xml Plug-ins: Ensure the web browser plug-in components are updated if you are launching the forms directly from a web browser interface.

Check Java Dependencies: Some legacy versions of the filler rely on specific runtime environments. Ensure your system Java or .NET frameworks are fully updated. Pro-Tips for Error-Free Submissions

Save Frequently: Always save a local backup copy of your progress as a .zfo file before attempting to hit the final “Submit” button.

Check the Log File: If an error is cryptic, look at the error log under the Help or View menu. The exact error code or server response string is usually listed at the bottom of the log. To narrow this down, please tell me: What exact error message or code are you seeing?

What government portal or form type are you trying to submit?

What operating system (Windows 10, 11, Mac via Wine) are you using?

I can provide step-by-step instructions for your specific scenario.