Running into an error when starting up OSL

[avaruuser]

Dear all,

I am running into an error during the installation of OSL:

Warning: Multiple versions of FieldTrip on your path will confuse FieldTrip 
Output argument "varargout{2}" (and possibly others) not assigned a value in the execution with "ft_notification"
function.

Error in ft_warning (line 58)
  [varargout{1:nargout}] = ft_notification(varargin{:});

Error in ft_defaults>checkMultipleToolbox (line 276)
  [ws, warned] = ft_warning(sprintf('Multiple versions of %s on your path will confuse FieldTrip', toolbox));

Error in ft_defaults (line 103)
  checkMultipleToolbox('FieldTrip',           'ft_defaults.m');

Error in spm (line 429)
    ft_defaults;

Error in initialise_spm (line 96)
    spm('Defaults','EEG')

Error in osl_startup (line 69)
    initialise_spm();

This error occurs even if I remove FieldTrip from my paths. What could be the cause of this?