MF Toolbox errors when trying to display scanner driver

Question

I have an ImageCLASS MF4890dw connected via wifi to a Windows 8.1 desktop.  I have installed the drivers and the MF Toolbox from the support site.  The printer function works fine.  And I seem to be able to scan a document by selecting PDF in the Toolbox and then pushing the green Start button. 
However, if in the Toolbox I check "Display the Scanner Driver" and then select Start, I run into problems.  The scanner driver window opens, but when I select either Preview or Scan, the scan fails to complete and gives error code 155,0,0. 
I have completely uninstalled the printer, drivers, and toolbox and then reinstalled them according to instructions I read on this site.  The only difference is than I have my printer connected via wifi rather than USB.
Any Suggestions?

Answer 1

Hi,
I did find the line in the code that is giving this error. The problem is I am unable to figure out why it is giving error:
The code fragment from http://doc.fumlersoft.dk/Java/jdk-1.2beta4/demo/jfc/Table/JDBCAdapter.java table model where the error lies is:
public String dbRepresentation(int column, Object value) {
        int type;
        if (value == null) {
            return "null";
        try {
             type = metaData.getColumnType(column+1);
        catch (SQLException e) {
            return value.toString();
        switch(type) {
        case Types.INTEGER:
        case Types.DOUBLE:
        case Types.FLOAT:
            return value.toString();
        case Types.BIT:
            return ((Boolean)value).booleanValue() ? "1" : "0";
        case Types.DATE:
            return value.toString(); // This will need some conversion.
        default:
            return "\""+value.toString()+"\"";
    }