Unable to open the TTL file created on WebVowl

[AnsariAltaf]

Hi team,
I had created an Ontology last week and saved it in Turtle format. Now when I am trying to open the same TTL file by uploading it in WebVowl, I am getting the below error.

Retrieving ontology from file: NewOntology (3).ttl
Parsing ontology with OWL API ... failed

Loading process failed:
Problem parsing inputstream:ontology23953225855189922
Could not parse ontology. Either a suitable parser could not be found, or parsing failed.

Failed to load ontology
Failed to convert the file.
Server answer:
{
"timestamp": 1661227200610,
"status": 500,
"error": "Internal Server Error",
"exception": "java.lang.IllegalStateException",
"message": "java.lang.NullPointerException",
"path": "/webvowl/convert"
NewOntology (3).zip

}

[jayh-aa]

Same issue I'm facing again, making use of the online service https://service.tib.eu/webvowl/

Retrieving ontology from file: NewOntology.ttl
Could not establish connection to OWL2VOWL service
Trying to convert with other communication protocol.