无法找到满足要求1.2.1.FINAL的springpython版本。

Question

当我试图运行pip install -r requirements.txt时，突然出现了这个错误：

Could not find a version that satisfies the requirement springpython==1.2.1.FINAL (from -r requirements.txt (line 11)) (from versions: 1.3.0rc1)
No distributions matching the version for springpython==1.2.1.FINAL (from -r requirements.txt (line 11))

这是我的要求.txt文件：

^{pr2}$

你知道怎么了？在