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Creative exchange throws error when click on export option

I'm doing export in creative exchange and getting below error.Zip file is not generating.

Message: Object reference not set to an instance of an object.

Source: Sitecore.XA.Feature.CreativeExchange
at Sitecore.XA.Feature.CreativeExchange.Services.Export.PageEnumerator.CalculateDepth(Item current)
at Sitecore.XA.Feature.CreativeExchange.Services.Export.PageEnumerator.Enumerate()
at Sitecore.XA.Feature.CreativeExchange.Pipelines.Export.Export.PageEnumeration.Process(ExportArgs args)
at (Object , Object )
at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists)
at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
at Sitecore.XA.Feature.CreativeExchange.Jobs.Export.ExportBackgroundJob.Run(GetExportContextArgs args)

Sitecore version : 9.1 initial version

SXA : 1.8