K2 back do main back after clik "new article"

Hi all,
i have a strange problem - when i click on new article in K2 component it moving me to main backend desktop.

can anyone know how to fix it ? i do not know when it is done... i do not touch this component expect import articles... but after import i check and everything was working fine.

now i try to add some article and i cant.... reinstal dont help...

one more thing - i just do moething likt that :

- i put on exist article and click - save and ceate new - articles was save and it open me module to create new article so i add photo, add tittle and chose category, after all i chose SAVE

article was save without any errors but.... it is no visible in frontend....

now everything is working fine so i hope it was only a momentary interruptions.