eclipse - when my system changed maven project giving error Error: Could not find or load main class -

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i check out svn project , run on system things working fine. give laptop department make ethernet port working after when run project showing 

error: not find or load main class

my laptop body changed os , other software remain same shift hard-disk other body. other simple java program running fine except svn maven project.

just press alt+f5 or right click on project go maven tab , click on update project. somehow works me :) wonder if can explain. target folder project add first go run configuration ->select class -> classpath tab->click user entries ->advance ->add external folder-> navigate target folder of project.





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