Qt Creator does not recognize semantic, but compiles it well

Exists function:

QByteArray normalizePacket(QByteArray & streamSnapShot, const int & indexOfByte, const unsigned char & indexOfBit, const unsigned char & length) {
...
}

when it called

QByteArray packet ( normalizePacket(streamSnapShot, packetByteIndex, packetBitIndex, packetLength) );

Qt creator underlines it and show as tip: "'stremSnapShot' is not a type name", but builds and compiles it well.