Meaning: The split connection has a predefined/expected number of inputs and outputs for defining a split connection. One or more of these inputs are missing, and therefore, the split operation cannot be completed. Why this would occur is unknown, and is not a user action issue but rather an internal software failure.
Recovery:
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Open the Structure task.
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Click Select .
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Set the Locate Filter to Split Connections.
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Select the split connection in error.
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Click Delete .
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Click Place Split and place the split connection again.