Error: 'Invalid procedure call check the time sequence of the supplied date parameters' when opening the plan or adding works orders

Cannot open the plan or add works orders due to the following error:-
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​An unexpected error occurred. Please report this problem to your system administrator with the following information:
System.InvalidOperationException: Invalid procedure call - check the time sequence of the supplied date parameters.
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This error is caused due to incorrect timing on some tasks. For example, Start Date and Finish Date of some tasks should not be the same. The Start Date must be before the Finish Date. A enhancement has been made in Orchestrate version 7.73 to rectify this issue. Please upgrade to this version or above. If the issue continues to occur, please raise a new case online and reference the title of this article.
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If importing from FactoryMaster, also check if a subcon purchase order was raised before planning the works order. If this has occurred, remove the subcon Purchase Order (PO) to resolve the issue.