The phrase "reason for this problem" is correct and usable in written English.
You can use it when you are trying to explain why something has gone wrong, for example: "We have yet to discover the reason for this problem."
The reason for this problem is the implementation of Zionism.
A big reason for this problem was ineffectiveness on first and second downs.
Sears officials, in interviews and court papers, repeatedly asserted that the reason for this problem was because Saturdays were the busiest days, but state law enforcement officials said that was untrue.
Part of the reason for this problem, Ms. Stahl said, is that much of the town is built on bedrock, and there is not enough soil to properly process the amount of sewage going into septic systems.
"She sat on my couch, and within 30 minutes she says, 'Yes, you do have a ghost in your house.' She goes into a trance, she came back to her body, and said, 'He's a Baptist minister, wearing a white robe, and he's roaming the house.' " The reason for this problem, incredible as it may seem, was recycling.
"The main reason for this problem is that few ATMs dispense £5s.
The possible reasons for this problem are endlessly debated.
While there are many reasons for this problem — most notably, insufficient money for food and housing — charter-school leaders, including those at Success, are also considering the impact of their own teaching precepts.
While one must sympathize with hard-working vintners who now face the loss of their livelihood, and even of their homes, it still is important to consider some of the reasons for this problem.
The reasons for this problem are usually the circumstances for why she wants sole custody: she wants to leave the state, she wants to move for a job or a relationship.
The reasons for this problem are twofold.
