Use python3 for testing the design file and use local for this.

workflow/conf/biohpc.config

@@ -5,6 +5,7 @@ process {
   // Process specific configuration
   $checkDesignFile {
     module = ['python/3.6.1-2-anaconda']
+    executor = 'local'
   }
   $trim_galore {
     module = ['python/3.6.1-2-anaconda', 'trimgalore/0.4.1']

workflow/main.nf

@@ -48,7 +48,7 @@ process checkDesignFile {
 
   if (pairedEnd) {
     """
-    python $baseDir/scripts/check_design.py -d $designFile -f $readsList -p
+    python3 $baseDir/scripts/check_design.py -d $designFile -f $readsList -p
     """
   }
   else {