IO.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like IO.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. ActivePerl) could share the same IO.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.
Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when IO.dll is attempted to be loaded either when ActivePerl is starting up, or in some cases already running. Some of the most common IO.dll errors include:
- Access Violation at address - IO.dll.
- IO.dll could not be found.
- Cannot find C:\Perl64\lib\auto\IO\IO.dll.
- Cannot register IO.dll.
- Cannot start ActivePerl. A required component is missing: IO.dll. Please install ActivePerl again.
- Failed to load IO.dll.
- The application has failed to start because IO.dll was not found.
- The file IO.dll is missing or corrupt.
- This application failed to start because IO.dll was not found. Re-installing the application may fix this problem.
Your IO.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with ActivePerl), or deleted by a malware infection. Furthermore, IO.dll file corruption could be caused from a power outage when loading ActivePerl, system crash while loading IO.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.
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