What version of K2 you are trying to install?
Is this a new install or an upgrade?
may be this:
As a test, can you create a simple SmartBox SmartObject then add it to the list of Selected SmartObjects, and see if that works?
Do you see the smartobject if you browse to the following URL via browser?
I would recommend applying latest CU and Fix Packs and see if that resolves the issue.
During upgrade k2 Five that database resides in Azure SQL, the following error may be encountered:
Could not successfully execute ac...
When navigate to K2 Workspace, the following error is thrown:
Initialization failed before PreInit: Wrong workspace configuration: C...
When running the K2 Connection String Editor, the following error is thrown:
When browsing to K2 Workflow REST API Swagger URL, the following error is thrown:
Server Error in '/Api/Workflow/V1' Application.
If you have 5.3 (5.0004.1000.2) version and you have applied some 5.3 Fix Pack ie. FP20 in this example.