"ambiguous base" error

[mhoover]

Hi,

I'm porting a co-worker's code to Qt4. It controls a huge vat of great-tasting lemonade. I think great-tasting lemonade should be controlled by a great-looking GUI. That's why I'm going to Qt4.

It compiles great with Qt3, but when I use Qt4 I get this error:

lemonDiag.C:590: error: 'QObject' is an ambiguous base of 'CHWController'

The line causing the problem looks like this:

QObject::connect(hwc,SIGNAL(ph_off_balance(double)),temp1A,SLOT(setValue(double)));

QObject::connect(hwc,SIGNAL(ph_off_balance(double)),temp1A,SLOT(setValue(double)));

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And the constructor looks like this:

class CHWController: public QObject, public QThread

class CHWController: public QObject, public QThread

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Could the dual inheritance be a problem? Is there a simple fix?
What should I do?