Probably this error is due to your project needing an specigic jdk

the way to solve this is this one:

- go to the folder where you are running eclipse
- find the eclipse.ini file
- add the next text before '-vmargs':
    -vm
    C:\Program Files\Java\jdk1.8.0_261\bin\javaw.exe
- CHANGE the path for the one of the jdk you need.