You may see this warning display if your download of the ParaChat class files is incomplete or corrupt. ParaChat software does not contain both signed and unsigned content. Answer "No" so the components are not blocked.
Clear your computer's Java cache of temporary files. To do so, open your computer's Control Panel, and double-click "Java". This will launch the Java Control Panel. Under the "General" tab, in the "Temporary Internet Files" section, click the "Settings" button. Click the "Delete Files" button. Check the boxes for "Applications and Applets" and the check box for "Trace and Log Files", then click the "OK" button. For more information, please see:
If the warning message still displays, configure Java's mixed code security verification to "Enable - hide warning and run with protections". To do so from your Java Control Panel, click the "Advanced" tab, expand "Security", then expand "Mixed code (sandboxed vs. trusted) security verification". Choose "Enable - hide warning and run with protections", then click OK to save your edit. For more information, please visit: