when I start my simulation file, call to Matlab function 'sum' aborted and a message like bellow appears

message:

''the working dimension was selected automatically, is variable-length, and has length 1 at run-time. This is not supported. Manually select the working dimension by supplying the DIM argument. Block Extended Kalman Filter/Extended Kalman Filter (#23) While executing: State During Action.''

what should I do?

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