(1st of this type)[Line 6 Sent ParlaMint-HR_2011-05-05-0.u72491.seg0.1]: [L2 Syntax invalid-deprel] Invalid DEPREL value '-'.

(1st of this type)[Line 6 Sent ParlaMint-HR_2011-05-05-0.u72491.seg0.1]: [L2 Syntax unknown-deprel] Unknown DEPREL label: '-'

(1st of this type)::warning::...suppressing further errors regarding Syntax

(1st of this type)[Line 43 Sent ParlaMint-HR_2011-05-05-0.u72491.seg0.1]: [L2 Format invalid-head] Invalid HEAD: '-1'.

...suppressing further errors regarding Format

(1st of this type)::warning::Format errors: 790

(1st of this type)::warning::Syntax errors: 2296

(1st of this type)::warning::*** FAILED *** with 3086 errors

(1st of this type)[Line 14 Sent ParlaMint-HR_2017-06-29-0.u38724.seg0.1]: [L2 Syntax unknown-head] Undefined HEAD (no such ID): '-1'.