An invalid date is trying to be parsed through PHP DateTime. Ensure you've latest CB nightly installed then see if issue persists. If it does check each of your date fields to ensure they've valid PHP date function formats.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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thanks for your help. I solved it. It was - as you wrote - a date-field, which went wrong. I don't know, what was it exactly, but i copied the value field from another (working) date-field. That's all.