SQl Index Error when clicking the Fix Idex and Export to CSV Button

When I tranbd click the Fix index or Create CSV button I get Error message below.

Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The system cannot find the file specified.

Does anyone know the fix?
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