Eclipse talks about errors, but no errors

At the end of Run X.exe ( Play button ) Eclipse asks for errors in the project. Continue launching? but there is nothing red, no errors in the project, it compiles the project too. Also, if I say yes, it runs the newly compiled executable without error.

At the end of the Build Project operation (key button) does not say found errors and also compiles successfully.

This suddenly started happening as the project grew.

Using Windows and MinGW 4.7.2.

EDIT

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The error has now changed. It says there are errors in the required project. Continue launching? However, it still compiles successfully and there are still no errors in displaying problems.