What Is ac1st21.dll

The ac1st21.dll is a file developed by Autodesk, Inc. and is used for AutoCAD component.

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Common ac1st21.dll missing errors

The ac1st21.dll file was not found.
There was a problem running the application because ac1st21.dll is missing from your computer.
Unable to find the ac1st21.dll file.
Violation in ac1st21.dll file.
Unable to load ac1st21.dll.
We are facing a problem starting ac1st21.dll and being unable to locate the related module.
ac1st21.dll has crashed.
ac1st21.dll registry error.
ac1st21.dll seems to be missing or corrupted.
Access Violation in the specified DLL.