Notice: Undefined index: name in feeds_tamper_copy_form() (line 19 of ...........

When using -dev, saving a "copy source value" plugin I get the following message:

Notice: Undefined index: name in feeds_tamper_copy_form() (line 19 of ...........

I had the beta 3installed and after reading the issues, uninstalled with 'modules / uninstall' and deleted the filemap
then installed the -dev version.
The "blank source 1" field I added (node processor mapping) while beta 3 was installed still existed when using -dev (plugins were not existing anymore).

Is the notice beacause of this? I am not a programmar and actually I even don't know what this meaning of this Notice is...

What should I do?