1. To resolve the above error go to Control panel-->Region.
2. Go to additional settings---> Select Decimal symbol as (.) and List Separator as (,)
3. Also, please select the format as English(United States) and after all these steps please execute the workspace and it will run without any error.
4. After following all the steps mentioned above, please restart the computer.
NOTE: 1. For every different Region format the Decimal Symbol and List separator will be changed. For example: If the format is
Czech(Czechia) then the Decimal separator will be (,) and the List Separator will be (;).
If you keep the Decimal separator (.) and List Separator (,) and choose the format as Czech(Czechia) then the workspace will throw an error.
2. In the attached workspace there is example of the Define Training testing node.