Weird Symbols showing up in the serial monitor

Hi, I would like to ask about the fact that my serial monitor is flashing up a line of weird symbols instead of the normal characters. This occurred when testing my code and arduino uno on the Love o meter project. If anyone knows how to fix this problem, pls reply thx.

Usually this means that you have a mismatch between the baud rate that you have serial monitor set at (in the combo box in the lower right corner) and the baud rate that you have used in your call to Serial.begin(…) in your setup() function.

These numbers must match.

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