The encryption key is invalid. See your system administrator.

Summary

Error "The encryption key is invalid. See your system administrator."

Description

Cause

Installation and data copy problems

  • Copying only MAS_XXX (company data) into the MAS90 folder breaks encryption compatibility in Sage 100 2018 (or later). 
  • Conflict caused by installing Sage 100 2018 over an existing MAS90 directory (and not removing the MAS90 folder before the installation).

General Ledger (GL) not configured in any company

  • Error accessing tasks if the General Ledger module isn’t set up in any company.

EXAMPLE:

Accessing the Visual Integrator (VI) module.

Installing a Sage 100 PDF Converter using PL_advancedoptions_ui.

Version-specific defects

  • Defect #110946 affects Sage 100 2018.7. Resolved in 2018.8 (6.00.8.0).
    • Installing Sage 100 and not converting data before printing a Library Master Report.  
  • Defect #110950 affects Sage 100 2019.1. Resolved in 2019.2 (6.10.2.0).
    • Occurs in a clean installation:
      • After converting ABC data.
      • Copying ABC company to a new company.
      • With a Role/User set up, logging in via Administrator login (not another user login).

Resolution

CAUTION: Use caution when working with the below product functionality. Always create a backup of your data before proceeding with advanced solutions. If necessary, seek the assistance of a qualified Sage business partner, network administrator, or Sage customer support analyst.

  

CAUTION:

Don’t install Sage 100 version 2018 or later into an existing MAS90 folder(with contents).

 Correct installation issues

  • Uninstall the new Sage 100 2018 or later version.
  • Remove the MAS90 folder and all contents.
  • Reinstall Sage 100 in a clean directory.

CAUTION:

Don’t copy only MAS_XXX data in version 2018 or later; this won’t work due to encryption.

Fix data copy issues

  • Don't copy only MAS_XXX company folders directly into a Sage 100 2018 (or later) MAS90 directory.
  • Remove incorrectly copied MAS_XXX folders.

TIP:

Copy both the MAS_XXX (company data folder) and the MAS_System (system) folders.
However, migrating to a new installation using the existing MAS90 folder as the source is the recommended method.

Set up General Ledger

If the error appears in Visual Integrator or when installing the Sage 100 PDF Converter due to General Ledger not set up in any company:

  1. Go to General Ledger, Setup, General Ledger Options in at least one company.
  2. Complete the setup for at least one company.

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Related Solutions

How to copy Sage 100 data to a different installation

Solution Properties

Solution ID
225924450087143
Last Modified Date
Tue Sep 08 15:56:34 UTC 2026
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