Synopsis
Netbeans have invalid values set for nbplatform.default.netbeans.dest.dir and nbplatform.default.harness.dir. You can change these values either globally or locally.
Global way
The default location for these nbplatform.default.netbeans.dest.dir and nbplatform.default.harness.dir are usually located in the file ~/.netbeans/8.2/build.properties
You can edit it with your favorite editor:
gedit ~/.netbeans/8.2/build.properties
Scroll down to the last line and you should see nbplatform.default.netbeans.dest.dir and nbplatform.default.harness.dir keys. Change their values to this:
nbplatform.default.harness.dir=${nbplatform.default.netbeans.dest.dir}/harness
nbplatform.default.netbeans.dest.dir=/path/to/your/Netbeans/Folder/netbeans-8.2
Note: Write actual folder where your Netbeans is installed.
Save and exit.
Verify if the problem is solved.
Local way (Making own default declarations):
1) Go to your project file default declarations (I suppose project name is cantact-app-master):
cd /path/to/Project/Folder/cantact-app-master/nbproject/private/
Note: Write actual folder where your Project is located.
Save and exit.
2) There should be some file called platform-private.properties, edit it with your favorite editor, otherwise create it:
gedit platform-private.properties
3) If in previous step, in case you edited it, you might encounter a line starting with a key user.properties.file. Anyways, comment it or if it is blank, write this:
user.properties.file=cd /path/to/**Project/Folder**/cantact-app-master/nbproject/private/build.properties
Note 1: Write actual folder where your Project is located.
Note 2: You can indicate build.properties wherever you want, but I assume that this is destination of this file.
Save and exit.
4) Create build.properties where you pointed user.properties.file key:
gedit build.properties
5) Add these lines:
nbplatform.default.harness.dir=${nbplatform.default.netbeans.dest.dir}/harness
nbplatform.default.netbeans.dest.dir=/path/to/your/Netbeans/Folder/netbeans-8.2
Note: Write actual folder where your Netbeans is installed.
Save and exit.
Hope this helps...