Error occurs before the Sage System Verifier runs. The Event Viewer lists a Buffer Overflow Exception (BEX) for TsVersionChecker.dll.

The full error may appear as:

Faulting application name: ap.exe, version:16.1.8.16, time stamp: 0x5a0b81d3 
Faulting module name: tsVersionChecker.dll, version: 16.1.8.16, time stamp: 0x5a0b7a9c 
Exception code: 0xc0000005 
Fault offset: 0x000070cb 
Faulting process id: 0x1300 
Faulting application start time: 0x01d4b4d2cc7a217f 
Faulting application path: C:\Program Files (x86)\Timberline Office\Shared\ap.exe 
Faulting module path: C:\Program Files (x86)\Timberline Office\Shared\tsVersionChecker.dll 
Report Id: 0a3c2390-20c6-11e9-80cc-00155d0e0e16 
Faulting package full name: 
Faulting package-relative application ID:

Missing or corrupt copy of TsVersionChecker.DLL on the new client installation.

1. Copy TsVersionChecker.dll from a working installation to the workstations with the issue.
    NOTE: The default path is "C:\Program Files (x86)\Timberline Office\Shared\tsVersionChecker.dll")
2. Try to open Sage again.

For other possible causes and solutions, see Error: "An error occurred. Close and then re-open Sage Desktop. See the log for details." (MASTER ARTICLE)