siksut
1. As DSummZZZ suggest you may want to modify you label, select all, and copy and paste it on the a new label. Sometimes reports get corrupted and creating a new one might solve the problem.
Although in this case I would tend to think it's more the way VFP addresses the printer driver in the preview mode. I believe it's different than sending it directly to the printer (since your report no error when you send it directly). If that is the case, a couple of options come to mind.
1. Do use the preview option.
2. If you need the preview option, use it but remove the printer icon from the preview toolbar and then send it to the printer directly.
3. Try sending your report to a different printer, see if you still get the error. If so, for example if you are using an HP PLC6 printer driver, try changing it to a PLC5 or PLC4 printer driver.