difficulty
‘difficulty’
A difficulty is a problem.
There are a lot of difficulties that have to be overcome.
The main difficulty is a shortage of time.
‘have difficulty’
If you have difficulty doing something or have difficulty in doing something, you are unable to do it easily.
I often have difficulty sleeping.
She had great difficulty in learning to read and write.
Be careful
Don't say that someone ‘has difficulty to do’ something.
Don't say that someone ‘has difficulty to do’ something.