Hi Biniam, Unfortunately, AdWords accounts have a limit of a maximum of 5 million ad group targeting items per account (such as keywords, placements, and audience lists). If you already have keywords added, I would recommend downloading the Keyword Performance Report <https://developers.google.com/adwords/api/docs/appendix/reports/keywords-performance-report>, identifying the keywords with low impressions (or the once which are paused as a result of campaign/ad group being paused), deleting the low impressions/paused keywords from your list and retrying your original API action.
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