Error running Toad with MS OS: "LexLib.lxl was not found and is needed."

Description

At the startup of Toad, the following error message is shown: 'LexLib.lxl was not found and is needed' on machine.

• Resolution
• WORKAROUND:
  Locate the LexLib.new file, located in the Toad for Oracle\User Files folder and rename the file to LexLib.lxl.
  (Note: This file maybe a hidden file under the Toad for Oracle folder.)

frm-40039 or frm-10102 can't attach PL/SQL library while opening form

Problem: FRM-10102: Cannot attach PL/SQL library APPCORE. 

This library attachment will be lost if the module is saved Solution. 

Need to add FORMS_PATH  in registry of windows.

Press Win R to open windows Run and put regedit to edit the windows registry.

and search ofr FORMS_PATH and custom Forms and plls path in this variable.

OR

FORMS_path variable in regedit.

   FOTMS_PATH=c:\DevSuiteHome_1\cgenf61\admin;