NLP Plugin: Fails to execute sample code

IMPORT nlp from lib_nlp; 

text01 := 'The quick brown fox jumped over the lazy boy.';
parsedtext01 := nlp.AnalyzeText('taiparse',text01);
output(parsedtext01);

text02 := 'TAI has bought the American Medical Records Processing for more than $130 million dollars.';
parsedtext02 := nlp.AnalyzeText('corporate',text02);
output(parsedtext02);

text03 := 'Right middle lobe consolidation compatible with acute pneumonitis.';
parsedtext03 := nlp.AnalyzeText('taiparse',text03);
output(parsedtext03);

text04 := 'TAI\'s stock is up 4% from $58.33 a share to $60.66.';
parsedtext04 := nlp.AnalyzeText('corporate',text04);
output(parsedtext04);

EXPORT nlp := SERVICE : plugin('nlp'), namespace('nlp'), library('nlp'), CPP, PURE
  string AnalyzeText(const string analyzer, const string txt) : cpp,pure,entrypoint='AnalyzeText';
END;

ECL_NLP_API void ECL_NLP_CALL AnalyzeText(size32_t & tgtLen, char * & tgt, size32_t anaLen, const char * ana, size32_t txtLen, const char * txt)
{
    {
        CriticalBlock block(cs);
        if (nlpEng == NULL) {
            nlpEng = new NLPEng();
        }
    }
    ostringstream sso;
    tgtLen = nlpEng->nlpEngAnalyze(ana,txt,sso);
    tgt = (char *) CTXMALLOC(parentCtx, tgtLen);
    memcpy_iflen(tgt, sso.str().c_str(), tgtLen);
}