What does this error message mean on ProQuest Dialog platform? - Request-URI Too Large

What does this error message mean on ProQuest Dialog platform? - Request-URI Too Large

When searching on the ProQuest Dialog platform, I get the following error message:

Request-URI Too Large

The requested URL's length exceeds the capacity
limit for this server

This error message occurs when there is a space between a search term and applied limited truncation. An example term would be:

suicid  [*4]

To correct this error, please remove the space between the search term and limited truncation as illustrated below:

suicid[*4]