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Runtime Error - JSAPI HelloWorld Program

 
Greenhorn
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While running basic HelloWorld program using JSAPI, it is showing error "java.lang.NullPointerException at HelloWorld.main(HelloWorld.java:11)"

Following is the code:

I edit my program:

and it is giving output:

It seems that SynthesizerModeDesc is working fine but it is not detecting any engine as i tried passing null also to the function Central.createSynthesizer (i.e get default engine) but still it is returning null. I checked number of engines it is detecting, but it shows 0.

Please help me !!
 
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