This is the 723rd most frequent Persian word.
مشکلی
Problem; issue; difficulty.
In this sentence, 'مشکلی' is used as a noun, meaning 'problem,' in the negative form 'ندارم' indicating the absence of an issue.
من مشکلی با این موضوع ندارم.
I don't have a problem with this matter.
Here, 'مشکلی' acts as a subject complemented by the relative clause 'که شما گفتید,' referring to a specific issue that was discussed.
مشکلی که شما گفتید حل شد.
The problem which you mentioned has been resolved.
In this example, 'مشکلی' is used conditionally to suggest the possibility of having a problem ('دارید').