ok. i upload my mp3 i just recorded and this is what it says

The sample rate of your mp3 is not a multiple of 11.025 kHz. Please encode your mp3 file at 11.025 kHz , 22.050 kHz or 44.100 kHz.

what does this mean and how do i fix it??
This may be a bit obvious but have you tried opening your newly recorded piece in a sound editing program and exporting it with correct settings?