file not found while empty project

[djeang]

java.lang.RuntimeException: java.io.FileNotFoundException: C:\Users\djeang\eclipse-workspaces\runtime-EclipseApplication\titi\build\output\titi.jar (Le fichier sp�cifi� est introuvable)
at org.jerkar.api.utils.JkUtilsThrowable.unchecked(JkUtilsThrowable.java:21)
at org.jerkar.api.utils.JkUtilsZip.zipFile(JkUtilsZip.java:348)
at org.jerkar.api.java.JkClassLoader.iterateClassesIn(JkClassLoader.java:451)
at org.jerkar.api.java.JkClassLoader.findMainClass(JkClassLoader.java:512)
at org.jerkar.addin.springboot.JkSpringbootPacker.makeBootJarChecked(JkSpringbootPacker.java:65)
at org.jerkar.addin.springboot.JkSpringbootPacker.makeBootJar(JkSpringbootPacker.java:55)
at org.jerkar.addin.springboot.JkSpringbootPacker.makeExecJar(JkSpringbootPacker.java:49)
at org.jerkar.addin.springboot.JkSpringbootBuild.pack(JkSpringbootBuild.java:49)
at org.jerkar.tool.builtins.javabuild.JkJavaBuild.doPack(JkJavaBuild.java:641)
at org.jerkar.tool.builtins.javabuild.JkJavaBuild.doDefault(JkJavaBuild.java:432)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)