try that

app.py

@@ -1,16 +1,13 @@
 import gradio as gr
-import nibabel as nib
-import pydicom
+# import nibabel as nib
+# import pydicom
 import os
 import dicom2nifti
 
 def convert(input):
-    # if linux
     path = input.name
     print("Zip file path:", path)
-
     assert path.endswith('.zip'), 'File must be a zip file'
-
     os.system(f'unzip -q "{path}" -d "{path[:-4]}"')
     path = path[:-4]
     files = os.listdir(path)
@@ -19,19 +16,18 @@ def convert(input):
         print("Dicom folder path:", path)
     dicom_files = os.listdir(path)
     assert [f.endswith('.dcm') for f in dicom_files], 'Dicom folder must contain only .dcm files'
-
-    print("This is the list of files in the folder:", os.listdir(path))
-    # create an output file that has the same name as the input file but with a .nii.gz extension
+    
     output_file = os.path.join(path, os.path.basename(path) + '.nii.gz')
     dicom2nifti.dicom_series_to_nifti(path, output_file, reorient_nifti=True)
     print("Nifti file path:", output_file)
-
     return output_file
     
 
-gr.Interface(
+app = gr.Interface(
     fn=convert,
     inputs=gr.File(type="file", label="Dicom folder (.zip)", file_types=["zip"]),
     outputs="file",
     title="Convert a Dicom folder to a Nifti (.nii.gz) file",
-).launch()
+)
+app.queue(concurrency_count=1)
+app.launch()