fixed issue with timestamp

nextflow.config

@@ -250,8 +250,8 @@ process.shell = ['/bin/bash', '-euo', 'pipefail']
 
 // Disable process selector warnings by default. Use debug profile to enable warnings.
 nextflow.enable.configProcessNamesValidation = false
-s.
 
+def trace_timestamp = new java.util.Date().format( 'yyyy-MM-dd_HH-mm-ss')
 timeline {
     enabled = true
     file    = "${params.outdir}/pipeline_info/execution_timeline_${trace_timestamp}.html"