Summary:
When Advanced Roadmaps fails to render due to an invalid date value in a project 
release or custom date field, the error message or server-side log should clearly 
identify:

• Which project contains the invalid date
• Which release/version is affected
• Which date field (startdate or releasedate) contains the invalid value

Steps to reproduce:
1. Set a release date of 9999-12-31 on any project version included in an Advanced Roadmaps plan
2. Open the Advanced Roadmaps plan
3. Observe a generic "Something went wrong" error with no indication of the cause

Expected behaviour:
A descriptive error message identifying the invalid date field and the affected project/release.

Actual behaviour:
Generic RangeError: Invalid time value with no actionable information.