Project cannot "Clean and Build" sucessfully

[Joe Don]

Hi great forum, I have been using NetBeans to build successfully but recently i encountered a disappointing problem. That is, my project failed to build. I encountered the following error messages on the console of NetBeans 8.0:

"ant -f C:\\Users\\joe\\Documents\\NetBeansProjects\\quickScores -Dnb.internal.action.name=rebuild clean jar
init:
deps-clean:
Updating property file: C:\Users\joe\Documents\NetBeansProjects\quickScores\build\built-clean.properties
Deleting directory C:\Users\joe\Documents\NetBeansProjects\quickScores\build
clean:
init:
deps-jar:
Created dir: C:\Users\joe\Documents\NetBeansProjects\quickScores\build
Updating property file: C:\Users\joe\Documents\NetBeansProjects\quickScores\build\built-jar.properties
Created dir: C:\Users\joe\Documents\NetBeansProjects\quickScores\build\classes
Created dir: C:\Users\joe\Documents\NetBeansProjects\quickScores\build\empty
Created dir: C:\Users\joe\Documents\NetBeansProjects\quickScores\build\generated-sources\ap-source-output
Compiling 2 source files to C:\Users\joe\Documents\NetBeansProjects\quickScores\build\classes
Copying 2 files to C:\Users\joe\Documents\NetBeansProjects\quickScores\build\classes
compile:
Created dir: C:\Users\joe\Documents\NetBeansProjects\quickScores\dist
Copying 1 file to C:\Users\joe\Documents\NetBeansProjects\quickScores\build
C:\Users\joe\Documents\NetBeansProjects\quickScores\nbproject\build-impl.xml:975: Existing manifest C:\Users\joe\Documents\NetBeansProjects\quickScores\build\null936298154 is invalid
BUILD FAILED (total time: 1 second) "

I have checked the absolute directory but seemed not to dictate any meaningful problem. May be the problem is dumb. Please, help me fix the unexpected problems. I trust this beautiful forum.

[Rob Spoor]

Joe Don wrote:C:\Users\joe\Documents\NetBeansProjects\quickScores\build\null936298154

Does that null belong there? Or is some property not resolved correctly?

[Joe Don]

The "null" actually belongs there. What I have copied here is EXACTLY what error information I have on the NetBeans console.

[Jeanne Boyarsky]

It "belongs there" in that it is in the error message. It doesn't belong there in that it is likely why the code is failing. The question is how to figure out what isn't set that is resolving to null.

[Joe Don]

I have judiciously tried to trace the factor leading to this mess but I couldn't figure it out. Any goodly, technically thought suggestions would be highly appreciated. I am already on cross road. More people, please, contribute.

[Ulf Dittmer]

I agree that it's worth checking out where that path with the "null" comes from. Apparently it's used (and failing) in line 975 of build-impl.xml, so that gives you a starting point.

[Joe Don]

Resolved! I had two already existing manifest files for splash-screen. I had to delete one and there it went well.

[Jeanne Boyarsky]

I wouldn't have guessed that. Thanks for sharing the solution!

[Joe Don]

Welcome.