Workflow editor not opening

Hi  please if you may help about workflow editor error on dynamics 365 for finance and operation on premises PU12.

I am receiving the below email whenever I try to open any workflow

Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of ax-p.bayan.local/.../Microsoft.Dynamics.AX.Framework.Workflow.WorkflowEditorHost.application resulted in exception. Following failure messages were detected:
+ Downloading ax-p.bayan.local/.../Microsoft.Dynamics.AX.Framework.Workflow.WorkflowEditorHost.application did not succeed.
+ The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

+ The remote certificate is invalid according to the validation procedure.

Many thanks.

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