diff --git a/collect.py b/collect.py
index 0f70226..256902c 100644
--- a/collect.py
+++ b/collect.py
@@ -211,13 +211,17 @@ print(timeEndScrape.strftime("%Y-%m-%d_%H-%M-%S"))
 os.chdir(path_to_tweetdfs)
 # At first check, whether all slices are present.
 tweetfiles = glob.glob("*.csv")  # get list of all csv files in folder - before: "*.{}".format("csv")
-for handle 
-for tweetfile in tweetfiles:
-     
+AllFilesList = []
+for handle in accounts:
+    for suffix in time_slices:
+        AllFilesList.append("Tweets-{handle}{suffix}.csv")
+with open(f"{logfile}missing-{timeStartScrape}") as fout:
+    for file in AllFilesList:
+        if file not in tweetfiles:
+            fout.write('Missing: {file}.\n') # if file is not in tweetfiles, print error message.
 # check if file_alltweets (previously scraped tweets that have been merged into one file) exists, if it exists, remove from list to not include it in the following merge
 if file_alltweets in tweetfiles:
     tweetfiles.remove(file_alltweets)
-
 # Go through all csv files and merge them into file_alltweets
 with open(file_alltweets, "wb") as fout:
     # first file (because of the header):