Troubleshooting CSV Upload Errors in Mixpanel Lookup Tables

Rahim N. · 2025-03-27 23:45:47.385821+00

I am trying to add a lookup table mapping, by upload a CSV. No matter what I put in the CSV (even if I paste the example from the official Mixpanel help page), I get an error "Sorry, an error occurred. Please try importing again."

Troubleshooting CSV Upload Errors in Mixpanel Lookup Tables | Mixpanel Community

3 comments

· Sorted by Oldest

kapa.ai
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Hi Rahim N., Please stand by as I search the Mixpanel knowledge base for an AI-powered answer. I normally take about 15 seconds or so. In case AI cannot answer your question, feel free to reach out to Mixpanel support at mixpanel.com/get-support. If you have follow-up questions for this thread, please tag me again with your question: @kapa.ai <follow-up question> 👋
Feel free to ask a follow-up question once I've answered by mentioning me with @kapa.ai
kapa.ai
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I'm sorry you're experiencing issues with uploading a lookup table in Mixpanel. Let me help troubleshoot this problem.Based on the knowledge sources, there are several potential reasons why your CSV upload might be failing:
Possible causes for the error:
1. CSV Format Issues: Your CSV must be valid according to RFC4180 standards. The first row must be a header with unique column names, and the first column is reserved for the join key with unique values and no duplicates.2. Size Limitations: Lookup Tables have a limit of 100MB per CSV file (roughly 1 million rows). If your file exceeds this limit, it will be rejected.3. Data Type Issues: Lookup Tables don't support Objects or List of Objects data types.4. Join Key Problems: Each value in the join key column must be unique with no duplicates and no falsy values.
Recommendations:
1. Check your CSV structure: Ensure it follows this format: LBKSsong_id,artist,genre,is_platinum,name,release_date c994bb,Drake,Pop,True,Hotline Bling,2015-10-18T22:00:00Z d8d949,Gipsy Kings,Flamenco,False,Bamboleo,1987-07-12T05:00:00Z a43fb8,Daft Punk,House,False,Aerodynamic,2001-03-12T07:30:00ZLBKS2. Verify your join key column: The first column must contain unique values with no duplicates.3. Check file size: Ensure your CSV is under 100MB.4. Validate data types: Make sure you're not using unsupported data types like Objects or List of Objects.5. Try a smaller test file: Create a minimal CSV with just a few rows to test if the upload works.If you continue to experience issues after trying these steps, you might want to consider using the API to replace a lookup table as an alternative method, which might provide more detailed error messages.For more information on creating and using lookup tables, you can refer to the Mixpanel documentation on Lookup Tables.
kapa.ai is still learning and improving, please let me know how I did by reacting below.
ℹ️ Tip: Mention @kapa.ai in the thread for follow-ups or DM the app for 1-to-1 help.
Rahim N.
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I get a 403: Failed to load resource: the server responded with a status of 403 ()

kapa.ai
APP
·
·
Hi Rahim N., Please stand by as I search the Mixpanel knowledge base for an AI-powered answer. I normally take about 15 seconds or so. In case AI cannot answer your question, feel free to reach out to Mixpanel support at mixpanel.com/get-support. If you have follow-up questions for this thread, please tag me again with your question: @kapa.ai <follow-up question> 👋
Feel free to ask a follow-up question once I've answered by mentioning me with @kapa.ai
kapa.ai
APP
·
·
I'm sorry you're experiencing issues with uploading a lookup table in Mixpanel. Let me help troubleshoot this problem.Based on the knowledge sources, there are several potential reasons why your CSV upload might be failing:
Possible causes for the error:
1. CSV Format Issues: Your CSV must be valid according to RFC4180 standards. The first row must be a header with unique column names, and the first column is reserved for the join key with unique values and no duplicates.2. Size Limitations: Lookup Tables have a limit of 100MB per CSV file (roughly 1 million rows). If your file exceeds this limit, it will be rejected.3. Data Type Issues: Lookup Tables don't support Objects or List of Objects data types.4. Join Key Problems: Each value in the join key column must be unique with no duplicates and no falsy values.
Recommendations:
1. Check your CSV structure: Ensure it follows this format: LBKSsong_id,artist,genre,is_platinum,name,release_date c994bb,Drake,Pop,True,Hotline Bling,2015-10-18T22:00:00Z d8d949,Gipsy Kings,Flamenco,False,Bamboleo,1987-07-12T05:00:00Z a43fb8,Daft Punk,House,False,Aerodynamic,2001-03-12T07:30:00ZLBKS2. Verify your join key column: The first column must contain unique values with no duplicates.3. Check file size: Ensure your CSV is under 100MB.4. Validate data types: Make sure you're not using unsupported data types like Objects or List of Objects.5. Try a smaller test file: Create a minimal CSV with just a few rows to test if the upload works.If you continue to experience issues after trying these steps, you might want to consider using the API to replace a lookup table as an alternative method, which might provide more detailed error messages.For more information on creating and using lookup tables, you can refer to the Mixpanel documentation on Lookup Tables.
kapa.ai is still learning and improving, please let me know how I did by reacting below.
ℹ️ Tip: Mention @kapa.ai in the thread for follow-ups or DM the app for 1-to-1 help.
Rahim N.
·
·
I get a 403: Failed to load resource: the server responded with a status of 403 ()

3 comments

Possible causes for the error:

Recommendations:

Possible causes for the error:

Recommendations: