The file m2550pud.dll is part of the 32 bit Konica Minolta Dialog Template (DLGTPL_DLL) from Konica Minolta. The Dialog Template is a piece of a printer driver used by a Konica Minolta printer.
A driver is a piece of software that allows a piece of hardware to work with your computer. Without this driver, your printer may not work as expected. If you get an error with a dll that is part of a driver, you can find your printer software and attempt to reinstall the driver, or you can try cleaning your registry.
Your computer contains many pieces of software, which are tracked by the Windows registry. Sometimes errors creep into the registry, and it needs to be edited to fix it. However, the registry is a complicated database, and it should only be edited by experts. Rather than hire an expert, just run ZookaWare PC Cleaner. ZookaWare PC Cleaner is 100% guaranteed to find and fix all the errors in your registry, leaving you to get back to printing.