There are various reasons for the error of mbam.dll. As you add an applications or program to your PC, the dll files may be deleted and it is missing. Sometimes, if you set up an application, it may rewrite your mbam.dll to the newest version. That is to say, you miss dll files, so you have mbam.dll errors.
Also, if your PC is infected by a virus, malware or worm, your mbam.dll may be replaced by malicious files, there may be an error of mbam.dll. And your sensitive data may be collected by cyber criminals as well. Sometimes, your mbam.dll files may be deleted, changed or corrupted, so you will see this errors message in your PC. Usually, the error message looks like the below: