undefined variable 'blur' in expression '-blur'

[prazeth]

I tried to use GMIC_Ascii_art Node in Natron 2.5.0 , and it gave me an error "undefined variable 'blur' in expression '-blur'

To Reproduce
Steps to reproduce the behavior:

1. Add read node
2. Add GMIC_ASCII_Art Node'
3. connect read node to gmic_ascii_art node input
4. connect gmic_ascii_art_node output to viewer
5. error dialog pop

Screenshots

Desktop (please complete the following information):

• OS: LXQt 20.04