I am writing an arcpy script and testing against a file Geodatabase. I can open the Geodatabase workspace and iterate through the "ListFeatrueClasses".

However if I try to "ListFields" I get an IO Error.

I have already tried changing the workspace directory in various ways as suggested by other posts with no success. I also made sure the file Geodatabase is fully accessible and currently its on my local drive.

This is the error:

Traceback (most recent call last): File
py", line 29, in
fields = arcpy.ListFields(fc1) File "C:\Program Files (x86) \ArcGIS\Desktop10.5\ArcPy\arcpy__init__.py", line 1138, in ListFields
return gp.listFields(dataset, wild_card, field_type) File "C:\Program Files
(x86)\ArcGIS\Desktop10.5\ArcPy\arcpy\geoprocessing_bas e.py", line 346, in listFields
self._gp.ListFields(*gp_fixargs(args, True))) IOError: "Test_Polygon" does not exist



import arcpy
from arcpy import env

arcpy.env.workspace = "C:/Users/username/Downloads/prime/Prime_Template.gdb/Prime_Template.gdb"

print "starting..."

featureclasses = arcpy.ListFeatureClasses()

for fc in featureclasses:
    print fc

fcList = arcpy.ListFeatureClasses()
print fcList
print "\n\n"
print "List Feature Class fields..."
print "\n\n"
for fc1 in fcList:
    fields = arcpy.ListFields(fc1)
    for field in fields:
        print "{0} is a type of {1} with a length of {2}".format(field.name, field.type, field.length)
  • Thank you for your comments but it actually never gets that far. I have also actually commented out everything starting with "for field in fields:" and after to be sure. I posted it here without the comment tag so everyone can see everything
    – Xavier
    Commented Feb 23, 2018 at 14:30
  • Yes, it does open in ArcMap and I am able to edit the data in the fields. But I will try the other suggestions as well.
    – Xavier
    Commented Feb 23, 2018 at 14:51
  • I made a new geodatabase and copied the feature class and it worked. Thank you! -- I do not know how to mark this questoin as answered and supply you with the credit
    – Xavier
    Commented Feb 23, 2018 at 15:19
  • Ah, glad we nailed it down! I've posted an answer you can accept, so we could close the thread! Commented Feb 23, 2018 at 17:07
  • 2
    Please don't add "thank you" as an answer. Instead, accept the answer that you found most helpful. - From Review
    – Dan C
    Commented Feb 23, 2018 at 17:32

1 Answer 1


If you are not able to read the feature classes using ArcMap connecting to this geodatabase, it may be corrupted.

If you are able, try creating a new file geodatabase and copy the feature classes into the newly created one.

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