To resolve this error, please check if your antivirus has quarantined our files such as encryptpdf.exe. Please do as follows:
Disable antivirus in the computer or server.
Assign this whole folder C:\Program Files (x86)\Easy Pay Enterprise v10\Program into your antivirus exception list.
Reinstall Access EasyPay and only install the Main Package. Refer to Install Access EasyPay.