Internal Server Error when using Browse API getItem

[yrxf4656]

When making an API call of the form:

https://api.ebay.com/buy/browse/v1/item/v1|275535584337|0?fieldgroups=PRODUCT

I'm getting the following error:

{"errors": [{
"errorId": 2003,
"domain": "ACCESS",
"category": "APPLICATION",
"message": "Internal error",
"longMessage": "There was a problem with an eBay internal system or process. Contact eBay developer support for assistance",
"parameters": [{
"name": "reason",
"value": "Failed to transform underlying error response, see logs."
}]
}]}

I'm pretty sure my access token is valid. Any ideas about what's going wrong?

[yrxf4656 · Accepted solution]

Figured out what the problem was: I needed to replace the pipe characters ("|") with "%7C". Problem now resolved, but that's not the most helpful error message.