I upgraded from Grails 2.2.4 to Grails 2.3.4 and am getting the error shown in the attached image with no further explanation on numerous occasions.
The only way that I have been able to recover is to remove all of the contents from the "target" folder under the project as well as the ivy-cache folder under the .grails folder.
The situation never arose under 2.2.4.
The environment is: Windows 7, 64-bit, JDK 184.108.40.206, Postgres 9.3.
Any thoughts, suggestions to tracking down the problem?