It is a grammatical error related to the incorrect use of past participle in the past perfect tense.
People often mistakenly use the simple past tense form "spoke" instead of the past participle "spoken". This happens because "spoke" is more commonly used and people may not readily recall the correct past participle form.
The correct form is "had spoken", which uses the past participle "spoken" as required in the past perfect tense.
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