I am starting to configure my development environment and I am using Spring Tool Suite 2.8.1 along with m2E 1.01.
As far as I can tell, since this is a Maven Project
Read the issue in Problems section,identify which dependency not able to read, then go the maven repository .m2\repository -> 1)check the dependencies and delete it from the folder 2)go to STS/Eclipse -> click on maven -> update project ->select the force update of snapshots/releases and click on ok.
or delete the dependencies from the .m2/repository and rebuild the maven --> update the maven project