Hardcoded the version of NWjs to 0.55.0 in the build scripts, as the latest version cause some problems.

pkg/mac/build-functions.sh

@@ -32,7 +32,10 @@ _build_runtime() {
     # YARN END
 
     # WGET:
-    NW_VERSION=$(yarn info nw | grep latest | awk -F "'" '{ print $2}')
+    # Comment out the below line as the latest version (0.57.0) having some
+    # problem, so for the time being hardcoded the version to 0.55.0
+    # NW_VERSION=$(yarn info nw | grep latest | awk -F "'" '{ print $2}')
+    NW_VERSION="0.55.0"
     pushd "${BUILD_ROOT}" > /dev/null
         while true;do
             wget https://dl.nwjs.io/v${NW_VERSION}/nwjs-v${NW_VERSION}-osx-x64.zip && break
@@ -460,4 +463,4 @@ _notarize_pkg() {
     fi
 
     echo "Notarization completed successfully."
-}
+}