I am currently working on tokenizing the data to do NLP Project. However, after cleaning the data, I have been encountering issues when tokenizing data. Below are data and code I am using un R.

MAJCOM/FLDCOM/DRU SCONO Text

1 USAFE Strengths strong suicide prevention programs and efforts operation grit asist ace feedback was provided i…

2 USAFE Strengths evidence based alcohol assessment tool echug data collection on behavior change risk protective…

3 USAFE Strengths staff can complete required trainings in a timely manner

4 USAFE Strengths majcom staff recognize team efforts and the contributions of each passionate team member

5 USAFE Strengths site are working on completing their cipp plans one site completed theirs february

6 USAFE Strengths growth of cat cab participation and attendance with many contributions from stakeholders and co…

7 USAFE Strengths installations also provide resilience events throughout the year

8 USAFE Strengths pre post test most effective evaluation tool rt now maybe they could not really give a clear an…

9 USAFE Strengths majcom working on a strategic plan q

10 USAFE Strengths usafe reports data driven efforts and both quantitative and qualitative data collection

Phase_1_Text %>% unnest_tokens(word, Text)
Error: 'list_c' is not an exported object from 'namespace:purrr'

After doing some research, I am unable to solve the issue. Please advise on how I can I fix it.