Thank you, Yumin and thanks again everyone for joining us on the call today. Our shareholder letter and supplemental slides contain all the figures and comparison unit. I'm not going to repeat every number, instead I'm going to focus on the factors that influenced results. As I speak, please keep in mind that we will discuss certain non-GAAP financial measures. We use non-GAAP measures because we believe they provide useful information about our operating performance that should be considered by investors, along with the GAAP measures. A non-GAAP to GAAP reconciliation is included in our shareholder letter. Let's begin with our Q4 financial highlights on slide 17. Revenue was $22.8 million, slightly below our guidance mid-point of $24 million due to a delayed project sale, which is now scheduled to close in the first half of 2022. As a reminder, project sales are large with unpredictable timing and the quarterly revenue will often fluctuate significantly. As such, we measure our success by focusing on profit and pipeline growth. This result revenue was $22.8 million, slightly below our mid-point of $24 million due to delayed projects. As such, we measure our success by focusing on profit and pipeline growth, this result was still very strong. However, as it represents 47% sequential and 39% year-over-year growth. Project Development revenue consists of sales of solar projects in Poland, Spain, Hungary and the U.S. IPP energy revenue came from 34-million-kilowatt hour generated by our rooftop DG Project in China and the U.S. Our GAAP gross margin for the quarter was 31.7%, which is below the guidance range that we provided, also primarily as a result of this project delay. Year-over-year, however, gross margin improved significantly from 12% in Q4 2020, was driven by our focus on high margin NTP sales supported by high margin IPP electricity sales. Moving onto the operating expense. This quarter, we were impacted by several non-cash items that caused our GAAP results to be unimpressive. And I will go through them one by one. First, we recorded a $2.3 million account receivable write-off related to our legacy manufacturing business as part of our receivable going process. Second, we issued $1.8 million in stock awards to key employees as part of incentive program to support our continued growth. Third, we record a $400,000 impairment for an IPP project in China, $200,000 write-off for fire accident at one of our IPP project sites. And lastly, we recorded a $200,000 project cancellation cost. As such, we recorded a GAAP net loss of $1.6 million in Q4, 2021. On a non-GAAP basis, however, our Q4 operating expense was only $4.3 million, and our non-GAAP net income was $2.5 million, or 11% of our revenue. Our results for the quarter were even stronger if you look at our adjusted EBITDA or free cash flow, which was $5.3 million and $5.5 million, respectively. For the full year 2021, revenue increased 8% year-over-year to $79.7 million from $73.5 million in 2020. High margin Project Development segment revenue increased 23% year-over-year to $61.1 million and they now represent almost 77% of our revenue, up from 67% in 2020. GAAP gross margin improved to 39.4% from 22.7%. GAAP net income increased to $6.9 million in 2021 from $2.8 million in 2020. Non-GAAP net income nearly quadrupled to $14.7 million from $3.7 million. Finally, adjusted EBITDA grew 58% to nearly $26 million. Now let's review the balance sheet shown on slide 20. Our financial position remained strong, and we have the ability to fund any number of initiatives and opportunities. Cash decreased in the quarter as we repurchased $80 million of our own stock and continued to paydown some of our debt. Our debt to asset ratio at end of Q4 was a record low of 10.3%. Now let's cover guidance as shown on slide 26. For 2022, we expect our revenue growth to accelerate, and for the full year to be in the range of $100 million to $120 million. We anticipate our Q1 revenue will only be between $3 million to $4 million, as the bulk of our project sales were scheduled to ramp beginning in Q2. We expect our gross margin for the year to be between 20% to 25%. For net profit, we are targeting between $9 million to $10 million for the full year, which is in line with our prior guidance of at least 30% growth. Finally, in regard to our share repurchase plan. As of today, we have completed repurchase of $20 million of ADS shares outstanding, and we still have $30 million remaining. We believe this share repurchase demonstrates the confidence of our Board and the management team in the strength of our business and the compelling growth opportunity in front of us. Thank you. And now, we would like to open up the call for any questions that you may have for us. Operator, please go ahead.