What is wrong with this Wireshark capture?

I'm learning how to do traffic analysis, and when analyzing this package I found the format and the yellow message strange. Can anyone explain to me what is in yellow?!
\[Expert Info (Warning/Protocol): Source MAC must not be a group address: IEEE 802.3-2002, Section 3.2.3(b)\] \[Source MAC must not be a group address: IEEE 802.3-2002, Section 3.2.3(b)\] \[Severity level: Warning\] \[Group: Protocol\]

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https://i.stack.imgur.com/hkOQ7.png

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