I'm getting USBD_BUSY when i try to transmit sensor readings from sensor to my computer via virtual com port

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I'm trying to transmit MPU6050 sensor readings to my computer via virtual comport.I'm using STM32 Nucleo F446RE. As far as i can see in debug mode there is no issue in sensor and sensor readings. Problem is I can't transmit them using USB. Are there anyone who have experienced this issue before?

In the tutorial I watched the guy can transmit sensor reading with USB port and can see them with a serial port reader program. I'm sure that there is no issue in sensor the card sees sensor. I don't know why it keeps returning USBD_BUSY.

Transmit Code I'm using

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