Summary
InputPins of the SendSignalAction do not match the Signal's Attributes.
Details
UML constraint:
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The number and order of InputPins must be the same as the number and order of Attributes in the Signal.
Example:

The "StartEvent" SendSignalAction is invalid, because the "location" Attribute of the "StartEvent" Signal it is calling is not matched to one of its InputPins.
Tips
When you get an R1380 error, verify the following:
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You have the same number of InputPins on the SendSignalAction as the number of Attributes of the Signal.
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Each Attribute is represented by one and only one InputPin.