Zebre's latest defeat came on Friday night when they lost 34-15 to Connacht at the Sportsground.
The Irish province scored five tries while Zebre could only manage two, with the second score coming in the final moments of the match.
Guidi said: "Early in the game we were close to scoring but we cannot concede three loose balls in the opponents' 22, which then gave rise to two opposing goals.
"In the first half we were also penalised by two problems with discipline and twice failed to find touch. At this level we are aware that with this type of error, you cannot compete.
"In the second half we played well and had the opportunity to score at least two goals against a defence that we knew was solid. It ended up only coming at the end.
"[But] let's go back to Parma with the confidence that certain players can compete at this level despite their young age and with the certainty that the work undertaken is bearing fruit.
"Leaving this field with this result hurts when the team competed against one of the best teams in the GUINNESSPRO12."
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Guinness PRO12 Zebre News
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