Warning issue - Error in the Matroska file structure at position

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Hi.

I am writing the app that uses libmatroska API (v 1.6.2).
It writes Matroska file that is in general ok and can be played.
But mkvtoolnix mkvinfo reports that warning mesage -

| + A track
|  + Track number: 6 (track ID for mkvmerge & mkvextract: 5)
|  + Track UID: 8719216602583683883
|  + Track type: subtitles
|  + Lacing flag: 0
|  + Codec ID: S_TEXT/UTF8
Warning: ./output.abrx: Error in the Matroska file structure at position
1053115. Resyncing to the next level 1 element.
Warning: Resyncing successful at position 1319081.
|+ Cluster
| + Cluster timestamp: 0.000s

Do you know what issue is here?

Regards,
Serghei

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<div dir=3D"ltr"><font style=3D"font-family:Calibri,Helvetica,sans-serif,se=
rif,&quot;EmojiFont&quot;" size=3D"3" face=3D"Calibri,Helvetica,sans-serif"=
 color=3D"black"><span style=3D"font-size:12pt" id=3D"gmail-divtagdefaultwr=
apper"><div style=3D"margin-top:0px;margin-bottom:0px">Hi.</div>
<div style=3D"margin-top:0px;margin-bottom:0px"><br>

</div>
<div style=3D"margin-top:0px;margin-bottom:0px">I am writing the app that u=
ses libmatroska API (v 1.6.2).</div>
<div style=3D"margin-top:0px;margin-bottom:0px">It writes Matroska file tha=
t is in general ok and can be played.</div>
<div style=3D"margin-top:0px;margin-bottom:0px">But mkvtoolnix mkvinfo repo=
rts that warning mesage -</div>
<div style=3D"margin-top:0px;margin-bottom:0px">=C2=A0</div>
<div>| + A track<br>

|=C2=A0 + Track number: 6 (track ID for mkvmerge &amp; mkvextract: 5)<br>

|=C2=A0 + Track UID: 8719216602583683883<br>

|=C2=A0 + Track type: subtitles<br>

|=C2=A0 + Lacing flag: 0<br>

|=C2=A0 + Codec ID: S_TEXT/UTF8<br>

Warning: ./output.abrx: Error in the Matroska file structure at position 10=
53115. Resyncing to the next level 1 element.<br>

Warning: Resyncing successful at position 1319081.<br>

|+ Cluster<br>

| + Cluster timestamp: 0.000s<br>

<br>

</div></span></font><div><font style=3D"font-family:Calibri,Helvetica,sans-=
serif,serif,&quot;EmojiFont&quot;" size=3D"3" face=3D"Calibri,Helvetica,san=
s-serif" color=3D"black"><span style=3D"font-size:12pt" id=3D"gmail-divtagd=
efaultwrapper">
Do you know what issue is here? <br></span></font></div><div><font style=3D=
"font-family:Calibri,Helvetica,sans-serif,serif,&quot;EmojiFont&quot;" size=
=3D"3" face=3D"Calibri,Helvetica,sans-serif" color=3D"black"><span style=3D=
"font-size:12pt" id=3D"gmail-divtagdefaultwrapper"><br></span></font></div>=
<div><font style=3D"font-family:Calibri,Helvetica,sans-serif,serif,&quot;Em=
ojiFont&quot;" size=3D"3" face=3D"Calibri,Helvetica,sans-serif" color=3D"bl=
ack"><span style=3D"font-size:12pt" id=3D"gmail-divtagdefaultwrapper">Regar=
ds,</span></font></div><div><font style=3D"font-family:Calibri,Helvetica,sa=
ns-serif,serif,&quot;EmojiFont&quot;" size=3D"3" face=3D"Calibri,Helvetica,=
sans-serif" color=3D"black"><span style=3D"font-size:12pt" id=3D"gmail-divt=
agdefaultwrapper">Serghei<br></span></font></div></div>

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