Error in Deleting an Issue & Uploading an Attachment

Hi

Need quick help in fixing this issue as this is a critical production related concern.
We face an Error in Deleting an Issue & Uploading an Attachment

The Error Log is below :

java.lang.NoClassDefFoundError: io/atlassian/blobstore/plugin/analytics/Event$Type
java.lang.NoClassDefFoundError: io/atlassian/blobstore/plugin/analytics/Event$Type
at io.atlassian.blobstore.plugin.analytics.EventPublishingBlobStoreService.delete(EventPublishingBlobStoreService.java:173) [?:?]
at io.atlassian.blobstore.plugin.TraceGeneratorBlobStoreService.delete(TraceGeneratorBlobStoreService.java:58) [?:?]
at com.atlassian.jira.issue.attachment.store.BlobStoreAttachmentStore.deleteBlob(BlobStoreAttachmentStore.java:209) [BlobStoreAttachmentStore.class:?]
at com.atlassian.jira.issue.attachment.store.BlobStoreAttachmentStore.deleteAttachment(BlobStoreAttachmentStore.java:183) [BlobStoreAttachmentStore.class:?]
at com.atlassian.jira.issue.attachment.store.DualSendingAttachmentStore$5.get(DualSendingAttachmentStore.java:106) [DualSendingAttachmentStore$5.class:?]