Unable to compile

[TenzinCHW]

I am on Ubuntu 18.04.3, running gcc 7.5.0 and used JUCE 6.0.1.

I am up to compiling the project using make but there seems to have been an error during compilation.

The first error is

../../Source/AudioIOComponent.h:128:65: error: ‘nonexistent’ is not a member of ‘juce::File’
     FileChooser chooser ("Select a Wave file to play...", File::nonexistent, "*.wav");

and the second is

../../Source/AudioIOComponent.h:206:74: error: no matching function for call to ‘juce::ScopedPointer<juce::FileOutputStream>::ScopedPointer(std::unique_ptr<juce::FileOutputStream>)’
     ScopedPointer<FileOutputStream> fileStream (file.createOutputStream());

I've tried to use an older version of JUCE (5.4.4) to generate the build files but to no avail.

Would appreciate any help.