The most common ground for a civil appeal in a situation such as this is to claim that there is no substantial competent evidence in the record to support the ruling. If the trial judge truly made no errors, you will lose the appeal.
As you have stated the issue, the answer is "No." But, your analysis of "no legal errors," is a conclusion, and may be in error. The evaluation of whether there were any legal errors is the very question one needs to decide before taking an appeal.
Ask your lawyer for an analysis of whether there are any appellate issues.
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Even if the situation were as you describe (and I doubt very much that a case can go through a trial on the merits without arguable legal error in the record) there remains the matter of whether the factual findings of the court are against the manifest weight of the evidence. A party that wants to appeal can almost always find a basis on which to do so.