MRS of the sentence How are you? not generating English sentence

When we ran the sentence “How are you?” We got this MRS. But when we want to generate MRS to English Sentence Ace is unable to generate the sentence.

LTOP: h0 INDEX: e2
[ e SF: ques TENSE: pres MOOD: indicative PROG: - PERF: - ]
RELS: < [ unspec_adj<0:3> LBL: h4 ARG0: e2 ARG1: x3 [ x PERS: 2 PT: std ] ]
[ which_q<0:3> LBL: h5 ARG0: i6 RSTR: h7 BODY: h8 ]
[ property<0:3> LBL: h7 ARG0: i6 ]
[ prpstn_to_prop<0:3> LBL: h1 ARG0: e9 [ e SF: prop TENSE: untensed MOOD: indicative PROG: - PERF: - ] ARG1: h4 ARG2: i6 ]
[ pron<8:12> LBL: h10 ARG0: x3 ]
[ pronoun_q<8:12> LBL: h11 ARG0: x3 RSTR: h12 BODY: h13 ] >
HCONS: < h0 qeq h1 h12 qeq h10 > ]

Could you please help us to understand what we need to do for generating English sentence?

Thank you for what turns out to be a bug report. The lexical semantics of the WH-word “how” was not properly indexed to enable the generator to produce it. This error has been corrected for the next release of the ERG, which should be ready soon. With the version you have, you can try generating other questions such as “Where are you?” or “Who are you?”, which should work fine. If you run into other surprising behavior, please continue to report it!

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I am curious to see what changes in the TDL files make that happen! In other words, what does indexing a lexical semantics of a word means?