The exact error message can be seen by using developer tools and capturing a HAR file as described here:
https://community.carbonblack.com/t5/Knowledge-Base/How-To-Collect-A-Har-File-Using-Chrome/ta-p/62472
When using the developer tools:
1. On the Enforce => Reputation => Upload => Upload History page
2. Open the developer tools
3. Reload the page
4. Select the Network tab
5. Select Preview
6. Select ORG_INDICATOR_LIST
7. Select one of the Numbered lists that match the Uploaded History list
8. Look for an errorMessage equal to either:
errorMessage: "Indicator Type SHA1 is invalid at line: [%]"
errorMessage: "Sha256Hash %a_hash_value% should be of length: 64 at line: [%]"
Here is a screenshot of what this will look like using Chrome developer tools:
Verify your hash lengths. For example here are the hashes for a version of Powershell.exe:
MD5 [32 char]: 852d67a27e454bd389fa7f02a8cbe23f
SHA1 [40 char]: 5330fedad485e0e4c23b2abe1075a1f984fde9fc
SHA256 [64 char]: a8fdba9df15e41b6f5c69c79f66a26a9d48e174f9e7018a371600b866867dab8