Error when attempting to integrate with eclipse after adding spock grails plugin to project

Error when attempting to integrate with eclipse after adding spock grails
plugin to project

References

Reference NO 1

http://stackoverflow.com/questions/15165999/error-when-attempting-to-integrate-with-eclipse-after-adding-spock-grails-plugin

Reference NO 2

http://stackoverflow.com/questions/14876999/grails-plugin-project-cant-find-groovy-jar-when-im-offline

Reference NO 3

http://stackoverflow.com/questions/7116368/an-error-occured-installing-the-plugin-shiro-1-1-3-unable-to-delete

Reference NO 4

http://stackoverflow.com/questions/18270763/how-to-force-grails-resource-plugin-load-right-after-application-started

Reference NO 5

http://code.google.com/p/spock/wiki/GettingStarted

Reference NO 6

http://spock-framework.3207229.n2.nabble.com/Grails-plugin-in-STS-2-3-3-M2-td5425927.html

Reference NO 7

#EANF#

Reference NO 8

#EANF#