system coupling error in two way FSI

I have simulated a two way FSI by ANSYS 2020R1. After doing all setups and execute the coupling system, I encounter the following warning 

Warnings were found during data model validation.                           |

+-----------------------------------------------------------------------------+

| Participant Fluid Flow (Fluent) (CouplingParticipant:Solution 1) has the    |

|     ExecutionControl 'Option' set to 'ExternallyManaged'. System Coupling   |

|     will not control the startup/shutdown behavior of this participant.     |

| Participant Transient Structural (CouplingParticipant:Solution) has the     |

|     ExecutionControl 'Option' set to 'ExternallyManaged'. System Coupling   |

|     will not control the startup/shutdown behavior of this participant.     |

+-----------------------------------------------------------------------------+

 

but the simulation was continued without error. however, when I have interrupted the run, save the project and then click on the continue calculation, I have got the following error

 

during the multiframe restart process the .rdb file was found but the .rnnn file was not found

 

any help will be appreciated.

 

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