Failed to load user preference file when opening Siebel Tools SBL-UIW-00138

Issue:

When try to login Siebel Tools error appear as below:

Failed to load user preference file 'E:\Siebel\8.2.2.0.0\Tools_1\bin\SADMIN&Siebel Tools.spf'(SBL-UIW-00138) 

Reason:

Can be multiple reasons, most common is due to disk space full Siebel Tools not able to write data in spf file on close.

Solution:

Go to file path delete or rename the file and try to login again in Siebel Tools.