eclipse WTP visual editor unsigned > error

[freeeki]

Hi,

i am trying to install the Web Tools Platform in eclipse as instructed in https://help.ubuntu.com/community/EclipseWebTools

when installing the "Web and J2EE development plugin group" i always get the same error at the end:

visual editor is digitally unsigend

when i proceed to install the installation stops due to "errors"

any ideas?

thanks...