Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment.

Error =>Java Build path Problem.

Sollution=> In eclipse right click on your project and select BuildPath-> Configure BuildPath.
In the Java Build Path window select Libraries tab and select JRE  System Library[J2SE-1.5] click on edit then select alternate JRE or work space default JRE and select jre1.8.0 and above. click on finish.
Apply.