Workflow Configuration Error

I am getting following error while creating a new workflow configuration or modifying existing one.

Error executing code: Query (data source) has no valid runable code in method ‘new’.

(C)\Classes\Query\new
(C)\Classes\WorkflowDocument\getQuery - line 12
(C)\Classes\WorkflowConfigurationBase\loadSubWorkflowTemplates - line 56
(C)\Classes\WorkflowConfigurationBase\init - line 89
(C)\Classes\WorkflowConfigurationForm\newForm - line 20
(C)\Forms\WorkflowConfiguration\Methods\build - line 9
(C)\Forms\WorkflowConfiguration\Methods\run - line 8
(C)\Classes\MenuFunction\run
(C)\Classes\WorkflowConfiguration\main - line 67
(C)\Classes\MenuFunction\run
(C)\Forms\WorkflowConfigurationList\Methods\createConfigurationrecord - line 11
(C)\Forms\WorkflowConfigurationList\Data Sources\WorkflowConfigurationTable\Methods\create - line 4
(C)\Classes\FormRun\task
(C)\Classes\SysSetupFormRun\task - line 20

This is the case with both Custom / Default workflows. Any idea what is wrong with it.

Rgds

Haroon